If you're on the Guru plan or higher, you can use the Post Planner bulk upload feature to upload multiple posts all at once.
Here’s a quick video that will walk you through this process:
If you want to upload images with text using the bulk upload file, you need to upload those images to your own web server or to a Dropbox folder first.
Once you've done that, copy the links for each image and then add it to the spreadsheet in the column marked LINK/ PHOTO/ VIDEO.
You can do the same for video uploads as well, however, the size of the video must be less than 100 Mb.