Re: mass delete of my gmail files
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This has been the third such question in recent days. B. Diddy answered, I think, that there doesn't seem to be, and I couldn't find it either.
I found there is actually one (in plain site) on the pc desktop site.
Even the 'desktop' view on Chrome's mobile browser, via the bottom 'desktop' link, not via Chrome settings, brings up a mini version of the full website and it isn't there.
So on the full page you are looking for the 3 oblong boxes upper left above the inbox.
Square tab, Refresh and More.
The square (select) tab comes with a dropdown list.
So I think you would need to delete/select /move all via the full pc desktop site that I don't think Gmail allows on any mobile browser, except maybe a tablet.
Someone's going to shoot this down now, I just know it.