On my Moto Power droid 10, the browsers (mine are Chrome & AdBlocker) are the only apps that give a choice between internal & external storage.
Open browser. Click not "Downloads," but "Settings," with an icon like a wheel or spoke.
THEN click "Downloads."
(The 1st "Downloads" is where you get to see what you downloaded.)
Choose between "Internal" & "External," & answer any other questions.
For the rest, choose a File Manager. Noodle around & figure out what to do.
I really like "Antivirus+ " free. Open the hamburger menu, 3 little lines on top of one another, on top left of screen. Open "File Manager." It contains clicks to various internal files, apps, pictures, movies etc, & to the sound card.
Figure out which files you want to move, or copy, & to where.
Select 1 or more files. At top, see the option to select all files in the folder.
I opened "Pictures," chose "Screenshots."
(Click the 3 dots at top right to create your own folder, say "6.12.2021 shots.")
Destination choices are at bottom. Copy to Cloud or Sound Card; press Submit to Share; etc. Press "More" to only move files.
Other file managers may be somewhat similar, with some differences.
Note that not all internal operating files can be moved. Maybe a rooted phone would be different.
Sorry so long!
StepStone
