Upload bug after moving from cPanel to Linux

[screamqueen]

my gallery and my friend's gallery were on another host before, it was using cpanel. we had to move, so a few days ago we made backups and migrated everything. i set everything up on my linux server, and we both did a fresh install of coppermine (cpg1.6.x-1.6.28), then moved our galleries.

after that, most of the themes stopped working, so we're both using the only one that works. my friend's gallery is completely fine, they're using coreh5a upload and can upload images without any issues. just to be clear, we are using the exact same theme and the exact same cpg version on a fresh setup.

after that, most of the themes stopped working, so we're both using the only one that works. my friend's gallery is completely fine, they're using coreh5a upload and can upload images without any issues. just to be clear, we are using the exact same theme and the exact same cpg version on a fresh setup.

but on my site, even though everything is fresh, when i upload images i get an error after the upload finishes, and the page doesn't redirect to the next step like it should. however, when i go back to the gallery homepage, the images are already uploaded. it's really weird.

how do i fix this? please help, my gallery has over 75k images 😭

[screamqueen]

update: i think this is an CoreH5A Upload (upload_h5a) v1.1 issue because when i check the configure plugin settings there's a "number of concurrent uploads" option from 1 to 4, and it's set to 1 by default. is there any way to increase this limit? single uploader works completely fine, only CoreH5A is not working.

also when i try to upload 9 images, only 1 actually uploads and the other 8 just turn red and stop.