I use syncthing. Share from any app, land on that directory on your server.

I think that limit (previously 5GB) is for files that they’ll store for you. Larger transfers are P2P only.

I recommend https://wormhole.app for the purpose. Drag, drop, leave the tab open.

Ubuntu touch supports it decently

Haven’t heard anything, just from memory of my own testing. Looking back at my notes I see a 40-50% speed up with VideoToolbox compared to x265 on M1, but at a lot crappier quality.

I haven’t tested in quite a while, though. I wrote off doing encoding on the M1, as my AMD cards are a lot faster (and produce better results).

It’s hard to beat a GPU in HEVC encoding performance. SoC:s have comparable performance to dGPU:s in that regard. A used zen/zen2 laptop might be a cheap and tiny workhorse for the purpose. I have a zen/vega10 matebook 2020 that does 1080p at around 2.5-3x real-time at high quality presets. No doubt it could do 4k at faster presets.

With the hardware in my arsenal I’ve found that AMD>Intel>nVidia, at least quality wise. VideoToolbox on Mac is down there with nVidia, and Apple silicon being pretty slow at it compared to software x265 on the same machine.