Just uploaded a lot of images & videos to my prime photo a/c... videos are a mix of MOV's from iPhone 6 & Fuji x-T1 DSLR.
All files upload to Prime photos ok via amazon drive app on iMac, & show ok on my Prime website with my iMac, but many of the video files on Fire Tablet Prime Photos app show thumbnails for videos ok, but when trying to playback I get a blank screen, with message "Unable to play video. Please try again later". All stills images are ok.
I also note that videos that were all working weeks & months ago now have broken icons for thumbnails!
This all appears to have happened since recent tablet software update?
Note Internet connection is ok 70mb fibre broadband.
I am experiencing exactly the same error message with a Kinde Fire for Kids running Fire OS 184.108.40.206 (626533320). It says that the devide is up-to-date when I check System Updates.
We got the device at Christmas and it was working perfectly. I tested all the video files and they would run through completely. Now this error message appears on all of them, the video formats are mp4 and mkv. I don't understand why they were running perfectly and aren't now.
For your information they are stored on a card, but we are also experiencing this problem with Watch & Read books from the Disney apps. These are installed on the device and were also working perfectly before.