Sample folder upload UI is a bit confusing

[yaxu]

Noticed in a workshop - when I browse for a folder full of samples to upload, I see the sample files but they're greyed out. When some others do it (not sure which browser but I think at least mac), the folders look empty. The folder upload works but it's a bit confusing. More generally it's not super clear at this point that you are uploading folders of samples and the folder is the name that is used in the end. Perhaps the 'import sounds' button could become a tab with an explanation and an upload button.

[yaxu]

The tab could also provide a test pattern once you upload e.g. n("0 1 2 3 4 5 6").sound("thefoldername") depending on the number of uplodaed samples