When uploading media to your WordPress site if you're getting the full error message below...
Invalid response status 44/ "post-processing of the image likely failed because the server is busy or does not have enough resources. "
...this is due to the filename containing a special character meaning when the return status message is created this is not handled by the uploader script and gives the invalid response status. To ensure you are able to upload those files you will need to remove the special characters and if you give this another try you will then be able to upload.