I've also had this issue on windows 10. After using NetLimiter (v4) to cap the upload speed for minecraft to 1MB/s, the upload completed on the very next try.
Minecraft for Windows 10 v1.19.21
I also have AT&T Gigabit Fiber.
I've also had this issue on windows 10. After using NetLimiter (v4) to cap the upload speed for minecraft to 1MB/s, the upload completed on the very next try.
Minecraft for Windows 10 v1.19.21
I also have AT&T Gigabit Fiber.