iPad Apple TV sidebar missing "Home Videos" and "Downloads"

Change in the way the system works. It seeded that before a drag and drop worked from the Finder. Now the .mp4 needs to be dropped into the iTunes Library first. Then the file(s) can be added to the mounted iPad in the iTunes app on the iMac. Why the original videos disappeared remains a mystery, but all the files were still on the iMac so were easily replaced using the above method. Once one file was successfully placed on the iPad, the "Downloads" and the "Home Videos" sidebar entries returned as well.

Trust device starts up and appears normal. Trust is successful. To paraphrase "Young Frankenstein" this is ABNormal. I will try the "Add to device" option and get back. What remains puzzling is the loss of the downloaded .mp4s along with the disappearance of the sidebar selections, as well as the inability to drag and drop as before.

Next effort will be to add a simple music file. I am somewhat computer literate, as I did, at one time long ago in a faraway time, support a couple of thousand Mac devices - networking mostly.

Still negative on any answer. The iPad is "Trusted". I entered the adin code on the iPad and trusted on the iMac. Slowly we sync and backup. I cannot get the "Downloads" nor "Home Videos" to appear as sidebar options. Not .mp4s can be loaded onto the iPad. Surely there is an answer to this failure somewhere.