Instructions for uploading the capx are in the "***MUST READ FIRST!*** Bug report REQUIREMENTS" post for submitting any bugs.
https://www.scirra.com/forum/must-read-first-bug-report-requirements_t61748
[quote:2zzc12tr]To save a .capx file, click "Save as single file" in the File menu. If you need a host, put it on a free Dropbox, OneDrive (formerly SkyDrive) or Google Drive account. We are unwilling to use file hosts which require an email address to be entered, and services which throw up loads of ads or make us wait for a time limit test our patience; use one of those three linked services which are all free and allow immediate downloads.
Due to heavy spam on the forum, we have to block the posting of links for new users. If your link to the .capx is blocked, either remove the http and www parts, or insert * characters through them, e.g.
example.com/myproject.capx
or
h*t*t*p://w*w*w.example.com/myproject.capx "