From what I've seen, you either get lucky with an upload or not and have to retry constantly, and thats not even a guarantee it will load properly without freezing or just not changing anything on your default character at all once you get it in game, seems like the feature is just ridiculously hit or miss and SDS dont care about fixing it.
Hope you get it to upload.

ethanicio_MLBTS
@ethanicio_MLBTS
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FaceScan stuck at 33%