Why is it when you save as a zip file, the drw files are not included?
Since they are linked to the prt files, I believe they should be included.
Technically they are not linked. The drawing file is more like a parent file to the part file.
These are a few occasions where drawing files are found as an option.
If you do it manually, just open all the drawings and create a backup folder. Save each drawing as a backup and purge the backup folder. Then zip everything up with Windows' zip app.
...edit: and welcome to the forum.
Thats pretty much what I ended up doing, just copied the drw files and added them to the zip.
I thought there might have been an option somewhere to include the drw's as well.
Food for thought for PTC.