about:upload limits (locked)

Upload limits are used, along with the moderation system, to prevent uploaders from flooding the site with too many low-quality images. You can see your current upload limit on your profile page or on the upload page.

Your upload limit controls how many status:pending or status:appealed posts you can have in the moderation queue at once. For example, if you have an upload limit of 15, then you can have 15 status:pending posts at once. When you reach your limit, you can't upload more until your existing uploads are either approved or deleted.

New uploaders should be careful about uploading too many posts at once. If you run out of upload slots, you may have to wait up to 3 days for your posts to be deleted before you can upload again.