You are able to load in any map you want in game. As long as Roblox Community Standards are followed, you will not be banned for uploading a map.
With that being said, uploading maps with any form of inappropriate imagery, language, or innuendo, even if it is hidden, WILL RESULT IN A PERMANENT BAN.
Just be reasonable, and ask yourself: “would a moderator approve of your map if they were to inspect it?”
Stick to the prop pack if you wish to use text for gameplay on your map.
TC2 Workshop Map Submission Criteria
The current TC2 map pool contains many TF2 maps, and that is something we are looking to change.
We want future maps to be high quality, completely original and consistent with other maps.
The only map that currently meets these standards is 3cp_yellowvalley, and even it has some flaws.
To increase your chances, study 3cp_yellowvalley attentively: detail, props, terrain, etc.
Maps should feel like part of the same world, not TF2.
High quality = craftsmanship that shows effort.
Completely original = every aspect created by the mapper.
Consistent = match the art-style & detail of existing TC2 maps.