PDF file not showing on the media picker screen on the classic editor

Expected behavior

To be able to select the PDF file that's been uploaded to the Media library on the classic editor to add it to the page/post on the app.

This can be achieved on the WP iOS app (version 15.6) but not on Android.

Actual behavior

Only photos are showing on the media picker screen.

Steps to reproduce the behavior

1. Go to My Site > Media and upload a PDF file to the site
2. Go to My Site > Site Pages or Blog Posts
3. Create a new page/post, or edit an existing page/post
4. Tap on the three dots and select "Switch to classic editor"
5. Tap the + icon and then the W icon
6. Only photos are showing on the screen, not the PDF file that's uploaded in Step 1.

Screenshots

Screenshot of the media picker screen on WPAndroid

Screenshot of the media picker screen on WPiOS (15.6)

Tested on [device], Android [version], WPAndroid [version]

Device: Oppo Reno 4
Android version: 10
WPAndroid version: 15.7-rc-2

Reported in 3314184-zen with WPAndroid version 15.6.

Start by reproducing the issue through My Site > Media and the classic editor's + > W media picker on Android, using the reported Oppo Reno 4 and Android 10 details as context. Compare the picker with the documented iOS behavior and verify that an uploaded PDF appears and can be selected alongside photos.