Upload library error with new Apple file format and HEIF

In my answer I assume you are using File Upload Class in CI3.

1. Try to remove all allowed_types at all, to check if file can be uploaded without that limitation. Probably HEIC/HEIF file is too large and goes beyound file upload limits defined in your php.ini
2. Try to add the following 3 extentions to allowed_types: avci, heics to support HEIF files that contain image sequences.

So your code should be (all lowercase is sufficient):

PHP Code:

$config['allowed_types'] = 'gif|jpg|jpeg|png|heic|heif|heics|avci';