Hi Woodworm, thanks for replying. So I logged into my Chromebook with my personal gmail acct, which makes me logged into my personal Email/Drive ect ect. Then, on the browser page, I logged into my work acct by clicking on my personal email addy (in top right corner of browser page), then clicking Add Acct. So now I am logged into both Google Accts.
Now I go into my work email, open an email with an attachment (in this case a pdf), then I click 'Download', the pdf goes into my 'Download' folder (which is where I want my downloaded files to go, set up via settings), then I open the pdf from my download folder and click 'Save File As'..it's here that it will only let me save it into my personal drive files. Now where will it allow me to choose which Drive I want to save it in. Sighh It's becoming increasingly frustrating. I've changed settings, read forums, messed around this and that ..and can't figure it out.