Bug overview description.

An error message appeared on the upload page when attempting direct URL upload from the following page (NSFW):
https://d.facdn.net/art/redrusker/1543344367/1543344367.redrusker_paigeforsyth_-_sharing_is_caring_[low].png

What part(s) of the site page(s) are affected?

https://e621.net/uploads/new

Errors or other messages returned (if any).

error: URI::InvalidURIError - bad URI(is not URI?): "https://d.facdn.net/art/redrusker/1543344367/1543344367.redrusker_paigeforsyth_-_sharing_is_caring_[low].png?danbooru_no_cache=08497b4c-c62c-4525-829c-0cb910cd90d1"

Screenshot of upload page:
https://ibb.co/hRcDxV5

Time of incident (if applicable).

2:55 PM EST, December 6, 2020.

Can you reproduce the bug every time?

Yes.

What steps did you take to replicate this bug?

1) Navigate to https://e621.net/uploads/new
2) Enter the given image URL

That image has already been posted here. post #2518157

gattonero2001 said:
That image has already been posted here. post #2518157

Yes, I uploaded the image afterwards using a file attachment from desktop.

songbird said:
Yes, I uploaded the image afterwards using a file attachment from desktop.

post #1872975 is flagged as an inferior version of your post, but they are the same size?

I hope you don't mind the annoying questions, I'm just trying to learn more about site mechanics

gattonero2001 said:
post #1872975 is flagged as an inferior version of your post, but they are the same size?

I hope you don't mind the annoying questions, I'm just trying to learn more about site mechanics

The original upload is a lossy JPG sourced from Twitter. The reupload is lossless PNG sourced from Fur Affinity. JPG leads to compression artifacts, which both reduce image quality and can lead to generation loss. e621 policy is to replace lower-quality posts with visually superior ones. See the Sites and Sources wiki page for more information.

songbird said:
The original upload is a lossy JPG sourced from Twitter. The reupload is lossless PNG sourced from Fur Affinity. JPG leads to compression artifacts, which both reduce image quality and can lead to generation loss. e621 policy is to replace lower-quality posts with visually superior ones. See the Sites and Sources wiki page for more information.

Thank you for the explanation, this is interesting to know.