Uploading multiple files doesn't work properly anymore

### Expected behavior

You should be able to upload more than 1 file at a time

### Actual behavior

The last file chosen is uploaded

### Steps to reproduce the behavior

- Go to the Files app, select a couple of audio/video files
- Share to Pocket Casts

Reported in #5640318-zen - mentioned that this started to happen after the recent iOS or Pocket Casts updates

##### Tested on [iPhone 14 Pro Max], iOS [16.1], Pocket Casts [7.25]

Reproduce the issue from the iOS Files app by selecting multiple audio/video files and sharing them to Pocket Casts, using the reported iOS 16.1 and Pocket Casts 7.25 versions if available. Trace the share flow's handling of the selected files and verify that every chosen file, rather than only the last one, is uploaded.

Written by the indexing model from the issue text.