If you have a photo-heavy project and would like to be able to upload up to 20 pictures at one time, you can create a photo album instead of multiple entries. To start a new album, click "add stories & photos" next to the green plus-sign at the top of the page and then click "add pictures."
From the drafting screen, select the chapter you'd like to place your album in and then click "add pictures." You can add up to 20 photos per album.
From the upload screen, you can edit, remove, and change photos. Once you've selected your desired photos, click the blue "upload" button to add them to your album. Once you've returned to the drafting screen, you'll have the option to:
Caption your photos by adding text to the corresponding box.
Rotate a photo by clicking the circular arrow below its thumbnail.
Rearrange your photos using the up and down arrow to the left of the thumbnail.
Remove a photo by clicking the "trash" icon.
Once you've added, organized, and captioned your photos and selected a chapter, click "publish entry" at the bottom of the page. If you'd like to save your album as a draft and come back to it later, click "save & close" at the top of the screen.