How do I upload an image without getting the 'invalid image' error !!
Is the file too large in size, or there is a particular pixel size for image
There are images you no fit upload for sites like imgur, but you can upload png and jpeg. Most images start from png and jpeg, you can upload ham on third-party sites like imgur.
You fit use this link for it:
https://bitcointalk.org/index.php?topic=5034682.0