Laravel - provider class not found

I know there's been numerous other posts like this, but none of them worked for me, and I'm at my rope's end - this is driving me nuts.

I'm using CloudConvert, which works perfectly on my local instance. When pushing up to my EC2 server, I'm just getting this error:

Class 'CloudConvert' not found in /var/www/html/api/app/Jobs/UploadFile.php:169

I've obviously tried composer dump-autoload which does nothing, tried composer update and composer install which did even less. I've removed any record of it, re-installed with composer require and then php artisan vendor:publish. Also nothing. Gave php artisan optimize --force but that's never really worked for anything.

I'm adding the service provider like so:

RobbieP\CloudConvertLaravel\CloudConvertLaravelServiceProvider::class,

...and the facade like so:

'CloudConvert' => RobbieP\CloudConvertLaravel\Facades\CloudConvert::class,

Once again, works perfectly locally. I'm sort of out of ideas.

Anyone got any insights I'm missing?

via Chebli Mohamed