Members help other members with technical questions and problems using Writing.Com!
That's working normally for me.
A pre-existing error condition for the cover would make adding a cover behave like that.
Per Covers from Writing.Com 101 --
1, Edit the checklist item cover, choose a Stock Cover, click Done, and save the edit of the item.
2. Open the edit cover again, click Advanced, check the box to remove the cover, click Done, and save the edit of the item.
3. Open the edit cover again and either a) use the image item number in the second box, or b) upload the image as the cover using the first box. Click Done and Save the Edit.
Hope that helps.