Hello and welcome to the forum,
If you import powerpoint slides, each ppt-slide will be turned into a FMR (Full Motion Recording) object blended into the background of the slide.
Could you explain what you want by applying a master slide to such imported PPT-slides? You have the option to have Master Slide Objects on Top, did you try if that is achieving what you want?
Thanks for your fast reply!
I wanted to overlay my company banner onto the powerpoint slide.
But I am guessing due to the format, it may be easier to simply overlay the banners individually on each powerpoint slide?
I just tried it out: imported PPT-slides, inserted a text caption (can also be an image) on the master slide without merging it into the background. I applied this master slide to all slides with the setting you can see in the screenshot and I got the text caption displayed on all slides. You can see here that the background of the slide is a SWF, the video recording of the parallel PPT-slide. What was your workflow?
If you want a more complex work flow, that allows you not to bother about the banner covering up something from the PPT-slides, check out my blog post thaat was explaining the workflow for captured slides, but can be applied to PPT-slides as well: