if you are getting this #Laravel #error :
Class 'League\Flysystem\AwsS3v3\AwsS3Adapter'"league/flysystem-aws-s3-v3
you have forgot to install league/flysystem-aws-s3-v3 - just run this command
composer require league/flysystem-aws-s3-v3
for #Laravel8 run this command;
composer require --with-all-dependencies league/flysystem-aws-s3-v3 "^1.0"
😎