no don't attach 1099/excel with personal info. You can add screenshot photos to a post with the buttons above if you have something without personal info, or even just pasting text/amounts here of an example sale where 1099b says one thing and excel says another; only if comfortable - it's your data. More specifics may help suggest a path forward.
Ultimately you may need to go the CPA route who can help you more directly to work with the data and resolve it, maybe it won't cost that much for some one-off consultation, and give you peace of mind in terms of the tax, audit etc. But you also said 20 people have looked at it, maybe you mean online support.
