Labelling a movie clip on iPad
I have made and saved .mp4 clips on my MacBook, all with their own file name identifying them, and then transferred them to my iPad. On the iPad they appear as black rectangles with just their running time showing - no names, titles or any identifiers. As there are several, I have no way of telling them apart.
I see two ways of achieving some identification, but I cannot get either to work.
1) Place a title on the first frame of the movie, so it shows in the black rectangle thumbnail. The trouble with using iMovie is that all the titles fade in, so the first frame is blank. Is there a way to place a title on the first frame so that it shows in the thumbnail?
2) On the iPad, use 'Files' to identify and re-name each movie file. The trouble here is that 'Files' is only showing PDFs and no movies. (Also, the PDFs cannot be opened as they are in the "Recently Deleted Folder"). How can I locate movies in 'Files', and then if I re-name them, will that name appear under their thumbnail?
Or are there any other ways I can achieve what should be an eminently achievable result? We have had the iPad for more than 10 years now, and Apple resolutely refuse to provide a basic file management system for their users. Is it that they just don't care, or is there a compelling reason why they can't?
Thanks for any help.
iPad mini 3, iOS 12