How can I opt out of it ?

Why did you highlight this out ?

Here it says that the app tracks and reports your activity. We usually use a VPN for privacy and anonymity. If the VPN tracks my activities and reports it, what's the point in using it at all ??

When l'm trying to upload a picture, it's just not accessing the folder where the file is located.

What is local disk cache ? I do my work on a small android phone.....

Yes, that's it.... I'm not being able to browse through my images for uploading it onto lemmy.......