Currently, KDE Connect on iOS devices can't keep connection for long time usage, and other devices will be disconnected with iOS devices, and if we reopen the KDE Connect app, those devices in "CONNECTED DEVICES" list will be in the "REMEMBERED DEVICES" list, then we have to refresh manually, after this, we finally can see devices in "CONNECTED DEVICES" list now.
Each time I want to push something to PC, I have to do "refresh-reconnect-push" task, which is very unfriendly.
To fix this, simply request "background fetch" permission should be fine.