If you create a shared folder using your OS (which in Windows creates an SMB share) you can then use any FOSS file browser app with SMB/samba support to move files back and forth directly. Many of them support that protocol since it's common. Amaze is one such app that I've used for this. You'll need to set the shared folder to allow write privileges if you'll be sending things from your phone, and you might want to protect it with a username/password for security.
Basically! I still haven't found equivalents for everything I was following on Reddit since my account there is 13 years old, but I have found more than I expected. Just since late June when I started lurking here it seems to have grown significantly. I suspect there's a higher proportion of longtime Redditors who have left recently since we've seen it abandon the principles it was founded on.