I have encountered 2 types of issues while we attach a file or screenshot to testrail when we update the result.
The attached file is not accessible. A broken icon of the file is seen and when we click on it, it navigates to a page with error message " An Error Occurred,
The attachment does not exist or you do not have the permission to access it."
When I upload multiple screenshots, few screenshots are missing from the list when I revisit the test case result again.