I think I found a bug while saving files in Dimension.
For example, if I have a 2Gb scene, delete all the objects and save it as an empty template (to have the same camera position, ambient light, etc), the new file is still 2Gb!
How can it be possible? It seems odd to me, is there any solution? I need to have a “blank” file to start importing object and ever have the same light/cameras.
I try to reproduce your file and get empty file 2.01 MB with 3 point lights and envirenment light. No objects has been placed on scene . After placing coffe cup I see light. file size is become 14 MB. What is your canvas size?
my canvas size is 4000x3000 px. Anyway you try to delete the cup of coffee ... and save the document. Now how big is your "empty" document? 2mb or 14 mb? Mine is 14 mb! and if you add yet another object and delete it ... the "empty" file gets bigger and bigger.
Yes, adding object increases file size and depend on models amount and types. But after deleting any objects it decreases again. My empty file is 2 MB anyway after deleting object or objects. Size of canvas do not play any role for file size ( I test it for your canvas size). I can't exactly explain how your file become bigger. Window has to overwrite the recent file with new one and remove trash info, but in your case it seems we have cumulative effects. Does it happens only with Dn file or with any other app file? Dn store any "other info" in yout case...
I on Win 10