Click the Options button on the toolbar.
On the Company tab fill in the "Maximum Image Size Allowed [MB]". The default Maximum Image Size Allowed is set at 1MB and it is possible to increase the setting to a higher number, but uploading large images rapidly fills up your database.
If the "Automatically Compress Larger Image" option is selected and the image is still above the max image size at 50% compression, you will receive a warning and be asked if you would like to save the image.
If the "Automatically Compress Larger Image" option is not selected and the image is still above the max image size, you will receive a message and not be allowed to save the image.