Did they change the features?

Did they change the features in the uploading a video via link?

normally there will be 2 buttons besides where u put the link u want to put on this side, the (similar) and (artist) button, but i noticed today when i tried to upload that the (artist) button is missing.

did they got rid of it?

The artist tag was merged with the "fetch source data" function (issue #3889), so that now one button does everything.

Unfortunately right now the related tags are broken on the upload page for the live site, so the artist tag won't show up (and neither will any other traslated tag). It was fixed on the source code but we're waiting for albert to update the site.

To find the artist tag you'll have to upload the post first, and then check the related tags on the edit box of the active post.

Edit: the change was deployed, so it should be fixed now.