You can select all types of media (GIFs, videos, and photos) at the same time but you cannot mix media types, as no social network allows it.

To bulk-upload media:

Go to Create and select Click or Drag & Drop
Alternatively, go to Media Library and select Add Media.
Decide where to import media from:

Google Drive;
Media Library;
Select or Drag & Drop Media;
Upload from external URL(s);

Choose the media you want to upload.
Finally, select Use Media and schedule away!

Learn how to schedule in bulk using Media Library here.
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