How do I attach a spreadsheet?

I have a spreadsheet bug to report. How do I attach a sample spreadsheet for the developers to test with?

Hello Todd,
Please click the button highlighted on the screenshot to attach a file. You have rights to attach files on this forum.

This is what I get when I try to upload an odt, ods, or lwp.

Would you pleaes add odt, ods, or lwp to the allowed list?

In the mean time, where can I upload an *.ods spreadsheet?

Alright, we will add odt and ods formats soon.
You can also upload files to a file hosting website and provide the link to us in cases like this one.

please add *.lwp too. Do you have a recommendaton for a file hosting site?

The proposed formats were added.

Awesome! Thank you!