Hi, amberrrapp94,
When you say “load”, are you uploading additional images that don’t currently exist in your “Media Library”? Or are you choosing the images that already exist in the “Media Library”?
In any case, I would suggest following these instructions:
https://navinrao.com/the-response-is-not-a-valid-json-response/
If the above doesn’t work, then I would suggest following these instructions that a plugin author, bfintal, suggested for diagnosing JSON issues and insert the “response” code you see into a new reply to this thread:
For Chrome:
?
?1. Right anywhere on the page, then select “Inspect” or “Inspect Element” to bring up the browser’s developer tools.
?2. Navigate to the “Network” tab of the developer tools
?3. Click on “XHR” in order to view only ajax calls
?
?You should end up with something that looks like this: https://cloudup.com/ctrVfdDqNh7
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?Once you’re there, save your page, then check last of the newly added entries in the network tab. Check the “Headers” tab of the new entry and you should see “/wp-json/…” in the “Request URL” to indicate that it’s a rest API call. Check the “Response” tab, the contents of that should ideally start with “{…”. If not, paste here what you’re seeing.