MS Powerpoint 16

Hi
I have just changed my computer to Dell Vostro 15. It came with Win 10 and Home and student Office version 16 pre installed.

I make lots of presentations, so far on Win 7 and Office 10. Nary a problem with file size.
This time it started not saving quickly to giving error msgs that to stop save I should press Esc.

I had to delete a lot of pictures and made it smaller. There seems some problem otherwise too as I could not even upload on my Google Drive.

1. Is there a limit on size?
2. what is stopping it from upload? there is no specific msg except "fail to upload"

What can be the problem and how can I fix it?

Thanks in advance.