Gimp wont keep merging when exporting

[rich2005]

Quote:... I tried multiple formats without success.

Might be the size of the image. or something else

If you have the screenshot as a jpeg or png try https://imgur.com/ - it is free. Then get the link and post here
or
Larger files and Gimp .xcf files try dropbox or similar and post the link here.

It would help if you also gave more details,
Merge images as a stack of layers, or maybe side-by-side or something else