How to get rig of the error "We couldn't save your comment..." in Jira comment section?

[Anna Kostenko]

Error message "We couldn't save your comment. The comment is too long. Try reducing its length, splitting it, or attaching a file to the work item" appears when I try to save a comment with an attachment. Deleting an attachment and attaching it to the comment once again doesn't help, as well as page refresh and opening Jira in another browser with cache and cookies cleaned.

My comment is not long

[Arkadiusz Wroblewski]

Hello @Anna Kostenko 

this message is usually not lying, even if your visible text looks short.

Why it happens:

In Jira Cloud the comment field has a hard size limit (~32,767 characters) and Jira counts everything, including hidden formatting / editor markup (ADF), pasted tables, inline images/GIF embeds, etc. So a “short” comment can still exceed the limit once you add rich content.
Reference: https://jira.atlassian.com/browse/JRACLOUD-64351

Also: Jira sometimes shows a generic / misleading “couldn’t save your comment” error around attachments/editor state.
Reference: https://jira.atlassian.com/browse/JRACLOUD-70142

What to do (works in most cases):

Strip hidden formatting

Copy your comment text

Paste it into Notepad / plain text editor

Copy again and paste back into Jira
(That removes the invisible bloat.)

Don’t embed media inline
If you inserted a GIF/image into the comment body, remove it.

Save the comment as plain text first

Upload the file via the issue Attachments section instead

Split the comment
If it’s a big table/log dump, split into 2–3 comments and attach the heavy parts as a file.

Quick check:
Try a brand-new comment with just test + attach the same file.

If even that fails, it’s more likely an attachment/upload problem (size/network/browser extension), not length.