Cannot download anything in One Plus One Resurrection Remix

[Android Central Question]

I think I have no rights to write anything on my phone, only for reading. It doesn't let me download anything from the browser, taking screenshots or download from Magisk Manager.

Also, I cannot transfer anything from USB instead even though it is activated. I just don't know what to do. I would really much appreciate if anyone can bring some light into this.

Thank you in advance for your time and consideration.