
I recently updated the theme and assorted plugins and this error started at that time.
For some reason I was able to upload a PDF file, but when I tried uploading a relatively small jpg file it wouldn’t work. There is no preview of the image and the folders were not created to hold it. I don’t understand why the PDF worked and the system made a preview. I went into the server with an FTP application and created the folders and dropped the JPG there. Nothing.
I read several articles in this help forum and even installed the String Locator plugin to see if I had the same problem with a typo and didn’t see that.

I do see a PHP update notice on my Dashboard, but when I contacted my host and they made sure the current PHP release was running on my server they said it was. The PHP notice is still there and I still can’t upload a JPG.
Don’t know how to read error logs or make sense of them. Would love some help. Thanks!