Where did my photos go?

I downloaded QuickPic for a few days to hide my Yaoi, but soon figured out I didn't like it so I uninstalled it. Then when I went into my gallery all of my photos were gone, important ones and everything. I reinstalled quickpic to see if they'd come back and they did, but only on Quickpic. I can't get them back into my gallery and its stressing me out because I hate the format and everything of this app. How can I get my pictures back into my gallery??

Back them up to the cloud, then download them to Google drive and also download to the phone.

Originally Posted by Android Central Question

I downloaded QuickPic for a few days to hide my Yaoi, but soon figured out I didn't like it so I uninstalled it. Then when I went into my gallery all of my photos were gone, important ones and everything. I reinstalled quickpic to see if they'd come back and they did, but only on Quickpic. I can't get them back into my gallery and its stressing me out because I hate the format and everything of this app. How can I get my pictures back into my gallery??