When a user is adding an Audio file to Roblox, they are forced to upload it to Roblox servers twice: once to estimate the price and once again to actually upload it. This is redundant and makes audio uploading take ages longer than it should, especially on slower connections.
Because the price is only being estimated, there is no reason for the user to send over the entire file just for the length to be returned back. The user should be able to get send the length of the file and get a price estimate for that length. That, or the audio file should already be uploaded and on Roblox’s servers when the user presses the buy button after the price is estimated.
There is also a huge lack of feedback when you are waiting for the estimated price of your audio file. The upload button just gets grayed out and there is no indication that something is happening. These factors all lead to an incredibly poor user experience when uploading audio and should be fixed.