I'm not sure for the OTG Keyboard, but I tested MoonReader+, Bookari, Alreader, and all, after some changes in configuration (mostly make them blank background without image) worked fine.
Instapaper was barely usable, Pocket didn't worked, Inoreader not even installed. Same with dropbox. OneDrive was usable if you have patience...
For the keyboard, as last resort, you can use a BT one (I haven't tested), but if it uses a lot of battery with BT off, with BT on must be a no-go.
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