shirleyhogan

I am still using PTE 9.0.  The first atttached screen shot shows the first three slides in my project.  The 2nd scrren shot shows the finished MP4 as it appears in File explorer.    What determines which picture will be used as the MP4 cover?    It doesn't seem to be consistent.   My bottom line question is "how do I make the first slide appear as the cover on the MP4 file?  

Thanks for any help.