I don't know how to upload .capx files.
Just realized you have posted this in the 'Bugs' section which is specifically for bugs in the Construct 2 software, which I highly doubt this is the case.
As such I must say that in order to post here, you MUST follow the Bug Reporting Requirements.
This guide also tells you how to provide a .capx for your report. Basically, save as a single file, then upload to a free hosting site, such as Dropbox, Google/Microsoft drive etc, and post the public link here.
Not following the requirements means this post will be closed automatically be Ashley.
If you think you have posted in the wrong section, then please repost in the 'How Do I' section, along with a .capx so we can see the problem you have.