No. Most likely explanation is that you have indeed no proper remote access.
There is Plex Relay, which can help in a pinch. However, it is limited to max. 2mbps bandwidth for Plex Pass holders.
That is usually plenty for music.
For video, although it is theoretically possible to reduce the bandwidth of a video to 2 mbps, but it requires
- the ability of the server to perform video transcoding at all (ensure it is not disabled in the server settings)
- the ability of the server to use hardware transcoding to the HEVC/(H.265) codec. https://support.plex.tv/articles/115002178853-using-hardware-accelerated-streaming/
(The default AVC/(H.264) is only able to achieve bad looking picture at only 2 mbps, thus you will need the more modern HEVC codec. However, old CPU/GPU chips don’t have support for this.)
The best way is to try and resolve the remote access issues.
