To add GIF files to your publication perform the quick steps described below:
Open the publication in the Edit mode
Click the GIF icon on the left toolbar
In the GIF Properties window click the Upload button
Choose the needed GIF file from your device and click Add to page button
Note: You can replace the uploaded file by clicking the Change file button
In case you want to replace the current GIF placed on the page
Select the GIF element
Click GIF properties ⚙ icon and
Either click Change file button to upload a new GIF in place of the previous one
Or Select From Library button to use an already uploaded GIF directly from your Library