Why can't we make gif of BTS?

[dap-addict]

Every time I try to make a gif of one of these nice GIO BTS recently and also before added to the main scenes the gif made actually shows footage from the main scene and not the BTS.

Why is this?
Could this be adjusted so that fans could also make gifs of BTS footage?

[dap-addict]

Here in that new Nuria Millan scene BTS I'd really like to show 15sec of the MU lady dressing up Nuria and then suddenly disappearing under the piles of cloths. LOL
https://pornbox.com/application/watch-page/846611 (GIO2677)
But no way I can render such a gif.
If I cut minute 03.25 to 03.40 in BTS for a gif, this main scene footage gets rendered:
Nice view ofc, but I want the MU lady from BTS disappearing unter the dress options!


It does however work on XFREAX special BTS compilations, though:
Nela Decker dressing up and interacting with actors (gif cut minute 30.25 to 30.40)
Here: https://pornbox.com/application/watch-page/196993 (XF138)

Why?