fix(mobile): share PDFs from the Android attachment viewer

apps/mobile/src/components/FilePreview.tsx

@@ -6,6 +6,7 @@ import ImageViewing from "react-native-image-viewing";
 import { useSafeAreaInsets } from "react-native-safe-area-context";
 
 import { openAttachmentInViewer } from "../lib/attachmentDownload";
+import { useMediaActions } from "../state/mediaActions";
 import type {
   ResolvedFilePreviewDocument,
   ResolvedFilePreviewSource,
@@ -20,6 +21,8 @@ function PdfDocumentPreview(props: {
   readonly onRequestClose: () => void;
 }) {
   const insets = useSafeAreaInsets();
+  const media = useMediaActions(props.source.actionsSource);
+  const save = media.actions.find((action) => action.id === "save");
   return (
     <Modal
       animationType="slide"
@@ -35,6 +38,19 @@ function PdfDocumentPreview(props: {
           presentation="inline"
           title={props.source.name ?? "PDF"}
           onClose={props.onRequestClose}
+          actions={
+            save
+              ? [
+                  {
+                    accessibilityLabel: "Save or share",
+                    icon: "square.and.arrow.up",
+                    disabled: save.disabled,
+                    loading: media.sharing,
+                    onPress: () => void save.run(),
+                  },
+                ]
+              : []
+          }
         />
         <PdfPreview uri={props.source.uri} />
       </View>

apps/mobile/src/components/FilePreviewModal.tsx

@@ -14,6 +14,7 @@ import { refreshAssetUrl } from "../state/assets";
 import { filePreviewGallery, filePreviewKey, filePreviewName } from "../lib/filePreviewGallery";
 import { FilePreviewGallery } from "./FilePreviewGallery";
 import { FilePreview } from "./FilePreview";
+import type { MediaActionsSource } from "../lib/mediaActionsSource";
 import type { FilePreviewItem, FilePreviewSource } from "./FilePreviewModal.types";
 
 export type {
@@ -67,6 +68,18 @@ async function resolvePreviewUri(
   return { uri: url + (item.srcFragment ?? "") };
 }
 
+// Shares from the unresolved item so remote URLs refresh and draft files take their own lease.
+function pdfActionsSource(item: FilePreviewItem): MediaActionsSource {
+  const metadata = {
+    name: filePreviewName(item),
+    mimeType: item.mimeType ?? "application/pdf",
+    ...(item.sourceIdentifier ? { sourceIdentifier: item.sourceIdentifier } : {}),
+  };
+  if ("uri" in item) return { ...metadata, uri: item.uri };
+  if ("attachment" in item) return { ...metadata, attachment: item.attachment };
+  return { ...metadata, environmentId: item.environmentId, resource: item.resource };
+}
+
 function ResolvedFilePreview(props: {
   readonly source: FilePreviewSource;
   readonly onRequestClose: () => void;
@@ -166,9 +179,16 @@ function ResolvedFilePreview(props: {
         : []),
     ]);
   };
+  const actionsSource =
+    selected.kind === "pdf" ? (selected.actionsSource ?? pdfActionsSource(selected)) : undefined;
   return (
     <FilePreview
-      source={{ ...selected, kind: selected.kind, uri }}
+      source={{
+        ...selected,
+        kind: selected.kind,
+        uri,
+        ...(actionsSource ? { actionsSource } : {}),
+      }}
       onRequestClose={props.onRequestClose}
       onOpenError={onOpenError}
     />

apps/mobile/src/features/files/ThreadFilesRouteScreen.tsx

@@ -845,6 +845,16 @@ export function ThreadFileScreen(props: ThreadFileRouteScreenProps) {
                 kind: "pdf",
                 uri: previewUri,
                 name: basename(relativePath),
+                ...(environmentId !== null && assetPreview.resource !== null
+                  ? {
+                      actionsSource: {
+                        name: basename(relativePath),
+                        mimeType: "application/pdf",
+                        environmentId,
+                        resource: assetPreview.resource,
+                      },
+                    }
+                  : {}),
               }),
           } as const)
         : null,