I Have An Issue With File View Serve File In My Site

My website runs with Elgg v3.3.24 and for a while there were no troubles. but now I started to notice that some pictures aren't showing up and if I post them again (embeded), then all the comments will be gone.
At this point I don't know which plugin is broken or what really happened.
These are the links samples:
Group-Rules

/serve-file/e0/l1613366964/di/c1/zNoOqctJTqEetpfgZ7zJUdCUEU3dfG7U7WEuSqMEK3g/1/49/file/largethumb1613366962group_rules.jpg 

/serve-file/e0/l1647634817/di/c1/5x2UpB9NNHielocjgUb30G826tDvwbxT1HVESq760C4/:OTUwMDAvOTU2MTAvZmlsZS90aHVtYjE2NDc2MzQ4MTZjdXRlLXB1cC5qcGc

/file/view/40643/group-rules#comments
I would like to fix these issues.
The page shows: HMAC mismatch Thank You.

  • I guess the problem is only with:
    /serve-file/e0/l1613366964/di/c1/zNoOqctJTqEetpfgZ7zJUdCUEU3dfG7U7WEuSqMEK3g/1/49/file/largethumb1613366962group_rules.jpg

    and the:
    /serve-file/e0/l1647634817/di/c1/5x2UpB9NNHielocjgUb30G826tDvwbxT1HVESq760C4/:OTUwMDAvOTU2MTAvZmlsZS90aHVtYjE2NDc2MzQ4MTZjdXRlLXB1cC5qcGc
    I appreciate tips on how to fix the " HMAC mismatch error"..

  • Discussed already.

    It's not recommended to use this way of embedding files.
    Use the download link instead.

    Try this: go to the security admin section and disable 'Session bound entity icons'

    Also, please don't duplicate the discussions here.

     

  • OK, Understood your tips, but, Can you say it is correct or something to be changed?
    At the site's "security admin section"  the check mark is in position OFF for  "Session bound entity icons".(color grey). Is that correct as default?

    Thank You.