MMU3. Feeding to FINDA, not proceeding

I just finished assembly and set up of my Mk4S, and was ready to begin testing printing using the MMU3, got it prepped to load to the first filament, fiddled with the weird cassette buffer which was kinda annoying, and got it fed through to the MMU3, but it wont "grab" it, i cannot feed it further, its just stuck as 25% loading filament, Feeding to FINDA. any tips or advice would be great, im knowledgeable on 3D modeling but my experience with printers themselves is limited let alone troubleshooting them or this specific model.

also is there any easier way of getting filament through that buffer? or is gently man handling it just "The Way" tm

SOLUTION LIKELY FOUND Edit: i think i found the issue, after grabbing the MMU3 and well, just holding it and looking at where it feeds into, the filament just kinda struggles to get inside, and then if it does get in proper, it struggles to feed straight, so basically ill just have to man handle the MMU3 and ensure that the filament is crossing through straight and narrow, guarantee if i try now with it in position it will feed just fine.

thanks to all the comments, really helpen me learn this machine, kinda regret not assembling it myself, but then again, the enclosure was an ordeal on its own, lol.