Post-processing of the image failed please help!

Hi everyone!

Please help! I’ve just started creating a blog on WP and I did not expect to encounter such issues from the get go. I have read a lot of threads on this error and tried many things and it still doesn’t work, I don’t know what to do anymore!

‘Post-processing of the image failed. If this is a photo or a large image, please scale it down to 2500 pixels and upload it again’

I asked my host to set-up SSL certificate, because it wasn’t set-up correctly, after that I lost the ability to upload images (although there were some instances where something did upload, but mostly not). I don’t know if these two are related though, my host checked the SSL and said everything is in order with that.

This is what i have done so far

– rolling back to other PHP
– rolling back WP version from latest to 5.2
– ‘Disable Big Image threshold’ plugin
– have the Default to GD plugin
– disabling plugins
– Uploading through the Browser Uploader takes me to a ‘This Site Can’t Be reached’ page
– Contacted host (Bluehost), they said it works on their end and they can’t do anything more, I think one of the things they tried was to increase upload size limit. I asked if they can disable ImageMagick, they can’t because I’m no a Shared server, I asked if they can disable modsecurity, they said that if there was an error on that it would be whitelisted by a specialist
– uploaded via phone on my 4G and it worked, Bluehost said that it’s could be a Network Provider issue, where they need to white list a certain IP address because it’s being blocked, I thought really?
– but I did call my network provider, they said they don’t bloack IP addresses and said I should reset the router and leave it off for 65 min to reset IP, done that, didn’t help
– theme (Hello Elementor) is up to date
– cleared browser cache, WP cache
– there are no apostrophes in the files
– tried different size files

Are there other people not being able to fix this? Surely this is quite a big issue and images are the lifeblood of blogging…. Can anyone help to fix this?

Thank you!