I would do as follows :
Save as, as it is in the same extention of the programme you are using. By this you will save all your creation as it is and allows you to modify or make changes in future, if at all you need to do.
After that once again clik on save as and select the extention you need i.e. .png, .jpeg etc.
In this case you need not to copy and paste on a new page. Whcich also takes a lot of time, if your LO's are in mbs.
