Publer allows you to bulk schedule up to 500 posts at the same time.

There are 6 ways to schedule in bulk:

Add Post
Bulk Upload
CSV File
Media Library
RSS Feed
Content

Note: You can add different text, media, hashtags, locations, or functionality options to each of the posts you're creating at the same time. Moreover, you can shuffle all the posts you're creating.

Also, remember that:

Twitter doesn't allow you to post more than 4 photos at a time.
Google My Business, and Pinterest only support single-photo posts.
Only Facebook, LinkedIn, and Twitter support GIFs via Publer.
You cannot mix different media types (i.e. photos and GIFs) in one post.

Updated on: 17/03/2023