fix: downloading backups in mobile webview (#1703)

packages/web/src/javascripts/NativeMobileWeb/ShareBlobOnMobile.ts

@@ -0,0 +1,10 @@
+import { WebApplication } from '@/Application/Application'
+import { getBase64FromBlob } from '@/Utils'
+
+export const shareBlobOnMobile = async (application: WebApplication, blob: Blob, filename: string) => {
+  if (!application.isNativeMobileWeb()) {
+    throw new Error('Share function being used outside mobile webview')
+  }
+  const base64 = await getBase64FromBlob(blob)
+  application.mobileDevice.shareBase64AsFile(base64, filename)
+}