Uploading a file in a book is failing with a 422 http code

[nLenouvelProxiad]

Cannot upload an attachment in a book to attach it into the book

Steps To Reproduce

1. Go to Books
2. Add a new book
3. Select the attachment icon on the right tab
4. Click on "upload a file" and select it
5. In the network, you can see a 422 http code ( Unprocessable Entity) is returned with that message {"file":["validation.uploaded"]}
6. At the same time as 5., in the console you can see :

POST https://rtfm.proxiad-axe-seine.com/attachments/upload 422 (Unprocessable Entity)
value @ app.js?version=v0.25.5:51
value @ app.js?version=v0.25.5:51
(anonymous) @ app.js?version=v0.25.5:51
(anonymous) @ app.js?version=v0.25.5:51
transformFile @ app.js?version=v0.25.5:51
o @ app.js?version=v0.25.5:51
value @ app.js?version=v0.25.5:51
value @ app.js?version=v0.25.5:51
value @ app.js?version=v0.25.5:51
value @ app.js?version=v0.25.5:51
value @ app.js?version=v0.25.5:51
(anonymous) @ app.js?version=v0.25.5:51
setTimeout (async)
value @ app.js?version=v0.25.5:51
(anonymous) @ app.js?version=v0.25.5:51
accept @ app.js?version=v0.25.5:51
value @ app.js?version=v0.25.5:51
value @ app.js?version=v0.25.5:51
(anonymous) @ app.js?version=v0.25.5:51

Expected behavior
I can upload and link a file to my book

Screenshots

Your Configuration (please complete the following information):

• Exact BookStack Version (Found in settings): 0.25.5
• PHP Version: have to ask
• Hosting Method (Nginx/Apache/Docker): have to ask

[ssddanbrown]

@nLenouvelProxiad I think this can often occur if the file fails to upload due to server upload size limits or due to file permissions.

I see your BookStack instance has since been updated to the latest version. Give it a try again and let me know if you still experience the same issue, without a helpful error message.

[ssddanbrown]

Due to the lack of response from the original issue author I will close this.

If this issue remains please feel free to open a new issue, referencing this one.