Depending on what storage driver you are using, you may get an error similar to the following when trying to upload a license:
Unable to upload license: load license: no space left on device
This is an error commonly seen by those running devicemapper on loopback mode.
From the Docker docs:
This configuration is only appropriate for testing. Loopback devices are slow and resource-intensive, and require you to create file on disk at specific sizes. They can also introduce race conditions. They are supposed for testing because the set-up is easier.
However, if you are not using devicemapper and are still experiencing this error, there are some known Docker workarounds.