Large PowerPoint file size when creating persentation in ppt online

[joytech]

When creating Powerpoint files in SharePoint online, the file size will show in Storage Metrics as several GB, but in Finder will show as several MB.

To resolve this we have to download file, delete from SharePoint, re upload.

The large GB files are having an impact on our overall SharePoint storage limits and we keep getting alerts of low storage space.

[#2]

You may want to check if the pptx file has many versions. These versions consume your storage quota.
There are PowerShell scripts and some 3rd party apps that can help identify these storage hotspots and purge obsolete versions.