Comment from ngumenawesamson on 2 April 2023 at 19:58

Forwarding this to Martin Raifer (Email Address, he could be of help!

Comment from tyr_asd on 2 April 2023 at 20:15

Hi! iD maintainer here (thanks Samson for the ping, btw).

The 400 error could be a temporary error, but could also be caused by a bug in the iD editor. Pretty hard to diagnose from a distance. @La Chaussiere: Could you please forward me some additional details (e.g. which API request failed, the full error message, etc.) about the error, so I can take a deeper look into what could be the root cause here. You can send it to or the email listed above (if you need assistance in getting these details, I can also give you a few pointers if needed).

That said, usually it is possible to restore the data after an unsuccessful upload and download the osmChange file on the upload form (see which contains all your data. This file can be used to upload your changes through JOSM if all else fails.

Comment from La Chaussiére on 2 April 2023 at 22:53

Thank you replying back. I will send tyr_asd an e-mail (to containing a screenshot I took with the error message.

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