I have selected the slideshows and started the process to DVD in PSE. I found that PSE will only accept the slideshows as 1 group and will not let me add slideshows later (unsupported and/or codec missing). Some slides get turned through 90 deg when put into PSE and one photo is not accepted, even though it's in jpg format, which all the other photos are. Can't see why this should be.
Initially tried to combine slideshows with vidoe project (which the help guide says is possibel), but find whichever way I start (slideshow or video) the adding format is considered as uncompatible. Can't see why there is a problem.