Hi
Sam.... - welcome to the forum!
Now, I don't do much w/ videos on my iPads (now have the newest Pro) but can offer a few areas to explore (one will cost money, so may not interest you). First, do you have iTunes (newest version) on your PC? If so, you can cable your iPad to the computer, open the device in iTunes, and select TV Shows 'On My Device' (see first pic below); then open TV Shows on your PC and observe the 'Sync' options (see second pic) - read up on 'what this accomplishes' since I have this disabled as shown, so no experience - note that the 'Sync' options for various features in iTunes can misbehave, thus the suggestion to google some discussion of using this option, but just for a start review this
Apple KB Article.
NOW, if you're willing to spend some $, then an alternative is to use
iMazing - check their website for pricing (may be a free DL but not sure what features are permitted?) - in the third pic below, iMazing is open on my MBPro (there is a PC version) and I've selected Videos -> TV Shows on my iPad; two TV shows are on my iPad - note the bottom right transfer options; in the fourth pic, one show has been selected which can be copied from the iPad to my laptop w/ either iTunes or a folder as potential locations. Hopefully, others may 'chime in' supporting these two suggestions or offering other options. Dave