We cannot test rtMedia with each and every plugin. We are using WordPress Media Library API which is a standard practice.
You may check with other plugins’ developer if they handles WordPress Media Library correctly. If there is any issue in rtMedia code, we will be happy to fix it right away.
So far, we have found many issues in different plugins and hence built our own. You may try our premium offering which will work for sure - https://rtcamp.com/products/rtamazon-s3/
Our Amazon S3 will not only work with rtMedia but with WordPress and any other plugin which follows WordPress standards.