There is no file when done this way....

On my PC..... when I have something on my screen that I want to share.... I hold down the Crtl key....
Then hit Print Screen.... this takes a screenshot and places it on the Clipboard...

Then open MS Paint....

If there is no new document.... select File>New..... then Ctrl-V or Edit>Paste to paste your screenshot....

When saving... be sure to save as JPEG .jpg bitmaps aren't accept on the forum.... (.bmp)