

Well android phones dont have removable sd card slots anymore, the only way to transfer files is over the weird protocol that’s slower than directly writing to disk, if you use pixel or Samsung youre already inundated with annoying ads. The ecosystem is pretty awful now. Installing a custom rom is a good idea, but depending youre phone model it could be a step down and if your on any Samsung phone with knox it basically irreparably damages some attestation fuse. Apple ain’t much better. I might try a Linux phone next.
What security holes? I think the bigger problem here is relying on a media platform to also maintain security protocols. Use authelia or plug some other well maintained and hardened security mechanism on top of jellyfin. Then put it in front of everything else like the arrs, etc. Its weird to me to just setup jellyfin, make it Internet facing, and believing everything is just gonna be safe and secure with no issue. Frankly id prefer if all these services came without security. Its a royal pain to bypass it for localhost or proxying with something like authelia.