Can't increase Attachment thumbnail dimensions

[XFFA.IR Bot]

I'm trying to increase the setting for attachment thumbnails from 150 to 200 or more and am receiving: Oops! We ran into some problems. Please try again later. More error details may be in the browser console. I'm currently using the PHP built-in GD image library and receive the same error message when attempting to raise the 150 to 151.

I haven't run the Rebuild attachment thumbnails in a long time, wondering if I should try that and/or try switching to the Imagemagick PECL...

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