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Victoria Symons's avatar
Victoria Symons
Brass Contributor
Oct 19, 2023

Cannot change the site logo thumbnail

I have several new sites where I cannot change the site logo thumbnail from the default image. I can change the 'site logo' but not the 'site logo thumbnail'. 
I have tried in different browsers, in private browsing, non private browsing but no matter what - when I go back in it has switched back to the default image. This seems to be a problem with new sites, older sites seem to be ok. 
This is quite annoying as the thumbnail displays in a number of places throughout SP....on the SP landing page and throughout the site/library settings.
Any help would be gratefully recieved. Thanks. 


  • Lucas_v 
    Hi Lucas.
    Thanks for your info. This is so annoying and somewhat intermittent. It's happening again on new sites today. 
    I have managed to get the logo thumbnail to stick today by going to Site assets, deleting the existing "__siteIcon__.jpg " and then quickly uploading a new logo with the same file name and extension in Change the look > Header > Change site logo thumbnail. 
    Bit of a phaff but it's sticking so far! Pngs are working for the site logo.
    Best wishes, Vicki

  • sopocoder's avatar
    sopocoder
    Copper Contributor

    I struggled with this for a while. Changing the site logo thumbnail for communication sites worked fine, but I could not change it for team sites. I tried:

    • different image file types
    • different image sizes
    • replacing the image files in Site Assets
    • setting the -HiddenFromExchangeClientsEnabled to true/false

    but none of these worked. I made the observation, however that for team sites with Teams activated, if I made myself an owner and updated the group logo in Teams it would update in the associated SharePoint team site as well. I assumed it had something to do with the Teams interface that made the difference, and so I was puzzled on how to do this for team sites that did not have Teams activated. However, the key was that I was making myself a group owner. The site logo thumbnail appears to be associated with the group in a way that the site logo is not. Thus, while you can update the site logo of a team site as site admin, you must be a group owner in order to update the site logo thumbnail. As soon as I made myself a group owner, I was able to update the site logo thumbnail from the SharePoint settings.

  • Lucas_v's avatar
    Lucas_v
    Copper Contributor

    Victoria Symons 

    Hi, I have been fiddling around with this issue for some time now and I don't seem to have a fix that permanently works.
    What I do have is some fixes you can try, but might not always work, or only work partly. They are combined into this instruction

    1. Get the picture you want to use for a thumbnail, and name it "__siteIcon__" (double underscores in front and at the end). Just that name and nothing behind or in front of it. 
    2. Make the picture a JPG format, this seems to be working the best for me. Also try to make it small in size, I have mine at 256x256.
    3. On your SharePoint Homepage go to Settings > Site Contents > Site Assets. There you can delete all the old images you used for the thumbnail (I believe all files with __siteIcon__ in front of it).
    4. Drag and drop/upload the local JPG file you just created to this library. Quickly after select the file, and check it out (for me the three dots in upper right corner)
    5. After this refresh the browsers cashe (Crtl + F5). It might take some time for the thumbnail to update across all sites. 

    I hope this helps you!

     

    Lucas

    • Victoria Symons's avatar
      Victoria Symons
      Brass Contributor

      Lucas_v 
      Hi Lucas.
      Thanks for your info. This is so annoying and somewhat intermittent. It's happening again on new sites today. 
      I have managed to get the logo thumbnail to stick today by going to Site assets, deleting the existing "__siteIcon__.jpg " and then quickly uploading a new logo with the same file name and extension in Change the look > Header > Change site logo thumbnail. 
      Bit of a phaff but it's sticking so far! Pngs are working for the site logo.
      Best wishes, Vicki

    • Tim_Gosling_ADL's avatar
      Tim_Gosling_ADL
      Copper Contributor
      Hi Lucas and Victoria,

      I have indeed found some success with using JPG images instead of PNG, which is a shame as I was hoping to include a transparent background around our Logo, but will have to settle for a plain white background in a JPG.

      I have however discovered that there are discrepancies with how this works between site types. The workaround seems to work for Team Sites connected to a 365 group, but not for team sites without a 365 group, and communication sites seem to have no problem at all.

      I am still not sure of the reason for the discrepancy, but it is quite frustrating.
  • Tim_Gosling_ADL's avatar
    Tim_Gosling_ADL
    Copper Contributor
    I have also been experiencing the same issue with Site logo thumbnails. I have been able to successfully change the site icon from the Settings>Change the look>Header>Display menu, but changes to the site logo thumbnail do not stay after saving.

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