When you get the error
“Post-processing of the image likely failed because the server is busy or does not have enough resources.
Uploading a smaller image may help. Suggested maximum size is 2500 pixels.”
during upload of images to your WordPress instance you can try the following:
- Open an FTP client e.g. Filezilla
- connect to your server
- open the wp-config.php file
- add the following line to the file
- save / upload
WordPress seems to run only with 32MB memory for its PHP runtime by default.
Increasing the memory limit seems to remedy the issue.