Add option to flatten auto-upload by moving photos from subdirectories to main folder and filter specific filenames

### Is your feature request related to a problem? Please describe.

Backgrond: Google Camera app creates a timestamped (unique) subdirectory for each portrait photo. It saves 2 jpegs for 1 portrait photo (original photo & bokeh-magic photo.)

Issue: The auto-upload folder uploads the timestamped subdirectories (with 2 jpegs) to the NC directory that I selected in the app. (Currently the app works literally as expected.)

### Describe the solution you'd like

Ideal Scenario: In the auto-upload options, include a toggle to: move photos in subdirectories directly to the folder above. A second option would be nice to include file with the word 'X'. 'X' = user input, since I always want the file with bokeh and not the original file. Google adds '_COVER' to the bokeh image.

### Describe alternatives you've considered

I attempted a few things.. 1) NC flow but it was my first time looking into flows and didnt get very far. 2) a modified G-Cam apk but it doesnt have saving options. 3) considered auto uploading to Google Photos (since Photos doesnt force subdirectories), somehow force a download to my phone, then changing the NC auto-upload folder to that DL directory.

### Additional context

Although it's not open-source, G-Cam takes great photos, even compared to many stock camera apps. Here is an xda link of G-Cam ports for various android phones: https://forum.xda-developers.com/apps/google-camera-mods