To give your post or page a sleek, professional look, you can add a Cover block.
Get started by clicking the + Inserter icon at the bottom-left corner of the screen and select the Cover block from the blocks list.
It will look like this:
Once you insert the block, you have some options. You can either pick a background color by tapping on the color circles or you can insert a background media. If you select the option to ADD IMAGE OR VIDEO, you will then need to select where you would like to add the media from:
Choose from Tenor allows you to search for GIFs provided by Tenor. (In the iOS app, this option will be Free GIF Library.)
Once you select either a media file or pick a color as your background, you can also add text on top of it