On release day i managed to import 305 vinyls consisting of around half logos and half livery designs that were made into vinyls to transfer over.
That happened almost instantly but everything was in a chaotic order and i didnt want to spend hours and hours sorting through the liveries since i wanted to play but i also didnt want to leave them on my storefront so i deleted all the livery parts and left the logos (in hindsight i should have just unshared them on 6), yesterday i decided to spend some time and get random cars to put the livery pieces on and them save them again so they would be in order so i clicked the import and waited for a while, nothing happened, tried again, same again, gave it a few hours and still notthing, booted up 5 un shared and reshared all my livery vinyls and booted up 6 again, clicked the import and nothing, the entire day i got no imports, tried again today, same again, just nothing importing atall.
Now i read through the bugs and noticed this:
Now im not sure if me importing over 252 Successfully has caused some sort of block to importing more or if it was a one time import (which i really dont see why that would be a thing) something is up, now i could understand the servers being under stress but that wouldnt really take over 24hrs to import when befoer it was almost instant.
Really hope this gets looked into soon 
PC, MS store/Xbox app version.
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If you try & import a whole bunch nothing shows up but if you do it one by one while painting a car they stamp to the car immediately & save to FH6 as well as sharing automatically. it’s bizarre.
Thats the way i originally got them from 5 to 6, i got in a car, apply vinyls & decals > + > Apply a vinyl shape > scroll all the way to the right (my fh5 vinyls) and select import from 5, then you get the message below:
but nothing happens, just leaves me with the ones i imported on launch day
Your OP is pretty much word for word what I experienced. Didn’t know about the import limit either and made 350ish vinyl groups with the same random results as you got. I numbered the vinyls instead of naming them, thinking they would upload in sequence
and gave up scrolling through after 60 odd. I deleted the remainder on H6 and went to H5 to rename and reshare… which led to some very long, frustrating sessions flitting back and forwards between games with nothing showing up whatsoever.
I finally lost my rag and decided to delete everything from both games and start again. This was tedious to say the least as you have to download the vinyls from the H5 Hub in order to delete them AND I also had the original version of each one that was sitting in “MY VINYLS” in the garage 
Since doing that I’ve had no problems, not sure what the issue was - I did wonder if H6 won’t recognise the surplus vinyl groups if you try to import more than the limit?? - but I’m glad everything’s working as intended..Because I wasted so much time on this, I’m now only importing enough vinyls to make designs for about 5 - 6 cars as and when I get them. It usually takes a few mins after requesting the imports so I do a race, smash some boards and when I go back to the garage they’re all there.
I’m also putting a 10x10 coloured square over each design ‘set’ so it’s easier to pick them out when they’re jumbled up 
H5:

H6:
Edit: I’m on a Series X