diff --git a/src/components/dialogs/nuxs/TenMillion/index.tsx b/src/components/dialogs/nuxs/TenMillion/index.tsx
index 4e7a171aad..8960824094 100644
--- a/src/components/dialogs/nuxs/TenMillion/index.tsx
+++ b/src/components/dialogs/nuxs/TenMillion/index.tsx
@@ -197,6 +197,27 @@ export function TenMillionInner({
   const isLoadingData = isProfileLoading || !moderation || !profile
   const isLoadingImage = !uri
 
+  const displayName = React.useMemo(() => {
+    if (!profile || !moderation) return ''
+    return sanitizeDisplayName(
+      profile.displayName || sanitizeHandle(profile.handle),
+      moderation.ui('displayName'),
+    )
+  }, [profile, moderation])
+  const handle = React.useMemo(() => {
+    if (!profile) return ''
+    return sanitizeHandle(profile.handle, '@')
+  }, [profile])
+  const joinedDate = React.useMemo(() => {
+    if (!profile || !profile.createdAt) return ''
+    const date = i18n.date(profile.createdAt, {
+      month: 'short',
+      day: 'numeric',
+      year: 'numeric',
+    })
+    return date
+  }, [i18n, profile])
+
   const error: string = React.useMemo(() => {
     if (profileError) {
       return _(
@@ -235,19 +256,34 @@ export function TenMillionInner({
               msg`Bluesky now has over 10 million users, and I was #${i18n.number(
                 userNumber,
               )}!`,
-            ), // TODO
+            ),
             imageUris: [
               {
                 uri,
                 width: WIDTH,
                 height: HEIGHT,
+                altText: _(
+                  msg`A virtual certificate with text "Celebrating 10M users on Bluesky, #${i18n.number(
+                    userNumber,
+                  )}, ${displayName} ${handle}, joined on ${joinedDate}"`,
+                ),
               },
             ],
           })
         }, 1e3)
       })
     }
-  }, [_, i18n, control, openComposer, uri, userNumber])
+  }, [
+    _,
+    i18n,
+    control,
+    openComposer,
+    uri,
+    userNumber,
+    displayName,
+    handle,
+    joinedDate,
+  ])
   const onNativeShare = React.useCallback(() => {
     if (uri) {
       control.close(() => {
@@ -490,11 +526,7 @@ export function TenMillionInner({
                             a.leading_tight,
                             {maxWidth: '60%'},
                           ]}>
-                          {sanitizeDisplayName(
-                            profile.displayName ||
-                              sanitizeHandle(profile.handle),
-                            moderation.ui('displayName'),
-                          )}
+                          {displayName}
                         </Text>
                         <View
                           style={[a.flex_row, a.justify_between, a.gap_4xl]}>
@@ -508,7 +540,7 @@ export function TenMillionInner({
                               a.leading_snug,
                               lightTheme.atoms.text_contrast_medium,
                             ]}>
-                            {sanitizeHandle(profile.handle, '@')}
+                            {handle}
                           </Text>
 
                           {profile.createdAt && (
@@ -524,14 +556,7 @@ export function TenMillionInner({
                                 a.text_right,
                                 lightTheme.atoms.text_contrast_low,
                               ]}>
-                              <Trans>
-                                Joined{' '}
-                                {i18n.date(profile.createdAt, {
-                                  month: 'short',
-                                  day: 'numeric',
-                                  year: 'numeric',
-                                })}
-                              </Trans>
+                              <Trans>Joined on {joinedDate}</Trans>
                             </Text>
                           )}
                         </View>
diff --git a/src/locale/locales/ca/messages.po b/src/locale/locales/ca/messages.po
index 180089fd1d..bb09cd6cf9 100644
--- a/src/locale/locales/ca/messages.po
+++ b/src/locale/locales/ca/messages.po
@@ -75,7 +75,7 @@ msgstr "{0, plural, one {# segon} other {# segons}}"
 
 #: src/components/KnownFollowers.tsx:179
 #~ msgid "{0, plural, one {and # other} other {and # others}}"
-#~ msgstr "{0, plural, one {i # altre} other {i # altres}"
+#~ msgstr "{0, plural, one {i # altre} other {i # altres}}"
 
 #: src/components/ProfileHoverCard/index.web.tsx:398
 #: src/screens/Profile/Header/Metrics.tsx:23
diff --git a/src/state/models/media/gallery.ts b/src/state/models/media/gallery.ts
index 9c8c13010d..828905002e 100644
--- a/src/state/models/media/gallery.ts
+++ b/src/state/models/media/gallery.ts
@@ -1,19 +1,20 @@
 import {makeAutoObservable, runInAction} from 'mobx'
-import {ImageModel} from './image'
-import {Image as RNImage} from 'react-native-image-crop-picker'
-import {openPicker} from 'lib/media/picker'
+
 import {getImageDim} from 'lib/media/manip'
+import {openPicker} from 'lib/media/picker'
+import {ImageInitOptions, ImageModel} from './image'
 
 interface InitialImageUri {
   uri: string
   width: number
   height: number
+  altText?: string
 }
 
 export class GalleryModel {
   images: ImageModel[] = []
 
-  constructor(uris?: {uri: string; width: number; height: number}[]) {
+  constructor(uris?: InitialImageUri[]) {
     makeAutoObservable(this)
 
     if (uris) {
@@ -33,7 +34,7 @@ export class GalleryModel {
     return this.images.some(image => image.altText.trim() === '')
   }
 
-  *add(image_: Omit<RNImage, 'size'>) {
+  *add(image_: ImageInitOptions) {
     if (this.size >= 4) {
       return
     }
@@ -59,7 +60,6 @@ export class GalleryModel {
       path: uri,
       height,
       width,
-      mime: 'image/jpeg',
     }
 
     runInAction(() => {
@@ -100,10 +100,10 @@ export class GalleryModel {
   async addFromUris(uris: InitialImageUri[]) {
     for (const uriObj of uris) {
       this.add({
-        mime: 'image/jpeg',
         height: uriObj.height,
         width: uriObj.width,
         path: uriObj.uri,
+        altText: uriObj.altText,
       })
     }
   }
diff --git a/src/state/models/media/image.ts b/src/state/models/media/image.ts
index 5c547c148f..55f6364911 100644
--- a/src/state/models/media/image.ts
+++ b/src/state/models/media/image.ts
@@ -1,14 +1,15 @@
 import {Image as RNImage} from 'react-native-image-crop-picker'
-import {makeAutoObservable, runInAction} from 'mobx'
-import {POST_IMG_MAX} from 'lib/constants'
 import * as ImageManipulator from 'expo-image-manipulator'
-import {getDataUriSize} from 'lib/media/util'
-import {openCropper} from 'lib/media/picker'
 import {ActionCrop, FlipType, SaveFormat} from 'expo-image-manipulator'
+import {makeAutoObservable, runInAction} from 'mobx'
 import {Position} from 'react-avatar-editor'
-import {Dimensions} from 'lib/media/types'
-import {isIOS} from 'platform/detection'
+
 import {logger} from '#/logger'
+import {POST_IMG_MAX} from 'lib/constants'
+import {openCropper} from 'lib/media/picker'
+import {Dimensions} from 'lib/media/types'
+import {getDataUriSize} from 'lib/media/util'
+import {isIOS} from 'platform/detection'
 
 export interface ImageManipulationAttributes {
   aspectRatio?: '4:3' | '1:1' | '3:4' | 'None'
@@ -19,6 +20,13 @@ export interface ImageManipulationAttributes {
   flipVertical?: boolean
 }
 
+export interface ImageInitOptions {
+  path: string
+  width: number
+  height: number
+  altText?: string
+}
+
 const MAX_IMAGE_SIZE_IN_BYTES = 976560
 
 export class ImageModel implements Omit<RNImage, 'size'> {
@@ -41,12 +49,15 @@ export class ImageModel implements Omit<RNImage, 'size'> {
   }
   prevAttributes: ImageManipulationAttributes = {}
 
-  constructor(image: Omit<RNImage, 'size'>) {
+  constructor(image: ImageInitOptions) {
     makeAutoObservable(this)
 
     this.path = image.path
     this.width = image.width
     this.height = image.height
+    if (image.altText !== undefined) {
+      this.setAltText(image.altText)
+    }
   }
 
   setRatio(aspectRatio: ImageManipulationAttributes['aspectRatio']) {
diff --git a/src/state/shell/composer/index.tsx b/src/state/shell/composer/index.tsx
index 612388ff86..6755ec9a66 100644
--- a/src/state/shell/composer/index.tsx
+++ b/src/state/shell/composer/index.tsx
@@ -36,7 +36,7 @@ export interface ComposerOpts {
   mention?: string // handle of user to mention
   openEmojiPicker?: (pos: DOMRect | undefined) => void
   text?: string
-  imageUris?: {uri: string; width: number; height: number}[]
+  imageUris?: {uri: string; width: number; height: number; altText?: string}[]
 }
 
 type StateContext = ComposerOpts | undefined