I tried to use E2E encryption. I got started and a dialog popped up, “write down these twelve words, they are your passphrase”.

Silly me didn’t write them down. I can still access my encrypted files from that device but not from any other device. The app has no option to show those twelve words again despite the fact that it knows them.

I do not reccomend you attempt to use this feature until this is fixed.

Please note that this (from github):

considering the fact that the user has a mnemonic passphrase to recover their key and any connected device (e.g. their smartphones) also has a way to recover the mnemonic we consider this an edge-case at the moment.

does note seem to be true.