I'm wanting to print file attributes in an asset listing page and I was wondering if there existed variables like: %asset_file_size%, etc. (the system itself displays file sizes for its assets)
Apart from the drop-down list in the editing toolbar and the list of keyword substites used for customising layouts, I don't know where to find (or how to create) variables.
If you are listing File assets, you can use the following keywords:
%asset_file_size_in_bytes%
%asset_file_size_readable%
The keywords are asset-specific: There is no global list of all of them. The best way to find the keywords for an asset type is to customise the asset listing for that type – the drop-down in the WYSIWYG will then show asset-specific keywords as well as the global ones.