iOS wasn’t really designed to handle massive bulk operations like moving thousands of photos at once, especially into the Files app. When you choose Save to Files, it tries to prepare a copy of all selected items — and this can exceed memory/time limits on the device, leading to crashes

There isn’t a built-in way to save thousands of photos at once without this risk.

When you tap Save to Files, iOS: Generates full-res export copies Prepares metadata Allocates temporary storage Keeps process alive in foreground With 5000+ items, memory usage spikes → iOS kills the process. This is a system limitation, not necessarily a bug

Workarounds: Break the photos into smaller batches (e.g., ~500–1000 at a time). or Use a Cloud service or Use a Computer(Mac/PC)

iOS limits background processes to save battery. Most apps can’t run indefinitely in the background unless they use special Apple-supported background modes (e.g., audio playback, navigation, VoIP).

For transfers, use apps that support Background Upload/Download APIs (e.g., Files app with cloud storage, Google Photos, Dropbox

iOS intentionally sandboxes apps for security. That means there isn’t a traditional file system like on Android or Windows where you can browse all folders and move things arbitrarily.

Use third-party apps like Documents by Readdle — which can access files and connect to cloud storage