postMediaChunked results in "Segments do not add up to provided total file size" twitter API error

[skorasaurus]

When uploading photos to twitter using the postMediaChunked method, I often get an error (~50%) from twitter's api:

"Segments do not add up to provided total file size"

My smallest test case is available (you'll have to provide your own env keys)
is https://glitch.com/edit/#!/alkaline-firewall?path=server.js:113:57

To reproduce:

1. open the glitch link; (will need to sign up to edit )
2. add your twitter credentials
3. click left side, lower-left hand corner click 'tools' then LOGS;
4. set myRandomINT to an integer between 1 and 8900 or use the function in there to generate one.

Upon any modification to the code in glitch, glitch automatically run the project; then visit the endpoint that you designate (it's in .env).

What I expect:
When the photo is successfully uploaded;

I'm not sure if it's a problem with twitter's API or if it's with twit just yet.

I'm using twit 2.2.11 but modified one additional commit - #456
added to it; correcting the highWaterMark variable. I also encountered this same error when I was just using vanilla twit 2.2.11

[skorasaurus]

Nope, I'm pretty sure it was just a problem with my code;

I was downloading a photo from a 3rd party api, saving it locally on the server, then uploading it to twitter.
What I think was happening was that the photo was not finished downloading before postMediaChunked was called.

I add an event so that postMediaChunked (in a callback) wasn't called until after the photo was finished downloading.