When using Film+ or Cinema HD APK’s, when I select a file with (DEB) to play, the option to PLAY, PLAY with Subtitles and Play with come up. When I select Play with Subtitiles, the files come up and I select one but nothing happens. When I select Play with, and I select MX player it buffers for a few seconds then starts playing. Then I hit pause and select the 3 dots in top right corner and click on subtitles, then online subtitles, then search… I scroll down and check enter title. I enter the name of the movie or TV series and the files fill up but i can’t check any box. A messaage at the bottom says “Can’t save files on your subtitle folder. Please check permission of/storage/emulated/0/subtitles” see next screen and I hit it and then I get a screen I have no idea what to do with. Can you help. Mayken
Hi, Mayken! Hubby & I use F+ a lot, along with Bee Player (or B Player) - (also not to be confused with the BeeTV APK ); we have F+ configured to use B as the default. We just choose ‘Play’, and when the vid begins, we press the bottom of the circle on our Fire Cube remote, which brings up a progress bar and several other icons; CC is dead center at the bottom - dropping down to it and clicking on it brings up a menu of available CC’s. Most times it works fine the first time; occasionally some will be out of sync, so I just choose until I find one that’s not. I realize you’re using different hardware, but aside from adding B Player to use, if you know what you need to press to bring up the onscreen icons in the app, I think it should work the same for you. Hope this helps! 
I’m having the exact same subtitle problem with my Buzz TV X5 and subtitles. Wondering if you ever found the solution to the problem