AwsS3 multipart with custom endpoints doesn't work with files <5 mb

[alv-axs]

Initial checklist

• I understand this is a bug report and questions should be posted in the Community Forum
• I searched issues and couldn’t find anything (or linked relevant results below)

Link to runnable example

No response

Steps to reproduce

1. Running a similar setup to this: withCustomEndpoints.html

2. Setting shouldUseMultipart: true,

3. Uploading a file > 5 MB - everything works as expected

4. Uploading a file < 5 MB - upload fails.

It was working correctly in Uppy v2, I recently upgraded to v4 and found this issue.

Expected behavior

File uploads successfully

Actual behavior

Upload process goes through signing successfully, but fails when actually uploading a file to pre-signed url.
Error: Non 2xx

[qxprakash]

Hi @alv-axs , thanks for the deatils on the issue , can you please clear the below points on How are you using the aws-s3 plugin

• Are you using a server for signing links links ? like this one -- https://github.com/transloadit/uppy/blob/main/examples/aws-nodejs/index.js

• Are you using it with Companion ?

• Also if you could provide your client code and the above details that would be helpful in reproducing this error

I tried reproducing your issue , with your above mentioned steps and the upload was succesful

1. Client code withCustomEndpoints.html

2. shouldUseMultipart: true,

3. Tried uploading Uploading a file < 5 MB

4. used this server for singing links

here is a video for your reference :

file size was 3.1MB
Using the latest version of uppy

aws_multipart.mp4

let me know if I'm missing anything.