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Thanks for including the text of your shortcodes; very helpful.
By default, [mla_gallery] selects items with post_mime_type=image. To select video files you need to specify an appropriate MIME type, e.g., post_mime_type=video or post_mime_type=video/mp4. Don’t forget to add that to both of your shortcdodes.
I am marking this topic resolved, but please update it if you have problems or further questions regarding the above suggestions.