In case you notice that your card, techpack or a folder is missing, follow these 4 simple steps-
1) First, refresh your page and see if the missing asset reappears.
2) Completely log out of your account and sign back in and check.
3) Make sure that you haven't archived them so check your archive sections. Here is how to locate them:
4) Despite trying the steps above your assets are still missing, report this issue here.