BT Cloud uploading / viewing RAW files

[soosieboo]

I've been trying to upload some of my RAW (Sony .arw) files. When they've been uploaded they show as blank thumbnails. If I click on any of them the 'viewer' screen says There was an error while loading this image, please try again later or download image to your computer and try viewing it there. 

All other files e.g. Jpeg, PDF all display thumbnails and open to view ok.

I've trawled BT cloud help pages but there is nothing that mention RAW files. 
There is very little on the web or in forums that relate to my problem. 

Can anyone help? Thanks.

[BuzzLightyear2022]

With RAW Sony .arw files, They may take alot of CPU resources on the server side to generate the thumbnails so is possible .arw files have been disabled for that matter, However the error you get "please try again later or download image to your computer and try viewing it there. " sounds like it stored in the BT cloud fine and will have to download to view them files.