Hey, first I want to appreciate you all for not leaving this issue forgotten, as TGA is basic foundation for my 3D work. Now as for the reply:
- a recent bug report on that should be lumped with the OP: Targa files cannot be uploaded to Roblox
- an old bug report (that was fixed) where Uploading .TGA file crashes website (March 2022)
I did notice TGA couldn’t be uploaded to the website anymore, however, I was able to upload TGA at the time after the date of the second link you posted (Between late 2023 ~ early 2024?), it was like the support was completely dropped sneakily. It started with the 3D importer, but then the issue followed with uploading it through different means.
- I think exporting the image/texture from Photoshop (or another program) from .tga to .png should work. It’ll have the alpha/transparency channel, but the color depth will be different and compression is there with .png.
The problem is that PNG gives white borders around the transparent area, as it does not store color correctly, like you mentioned. This makes achieving certain effects almost impossible, especially when it comes to 3D work. The workflow is very different too, and I find it a lot easier to work with the alpha channel workflow of TGA.