How can change the file types / sizes that can be uploaded?

The following settings in System Management facilitate this:

Name	Example Value	Description
UploadWhiteList	doc,docx,pdf,png,jpg	This is a setting for the Upload of evidence in forms. This controls the types of files that are permitted. This list would normally only be used if a specific type of file is allowed, as the black list is present below to prevent any disallowed file types. File types are added using their extension and multiple types can be added by separating them with a comma. For example if only MS Word documents were allowed you could add the following: doc,docx
UploadBlackList	exe,dll,vbs,ini	The black list is the list of files which are NOT allowed to be uploaded. This allows specific file types known to be commonly used for viruses to be listed.
UploadSizeLimit	10000	This allows one to specify the maximum size of any single file in bytes. I.e. 10000 is roughly 10MB
UploadTotalQuota	30000	This is the maximum limit of ALL files uploaded i.e. roughly 30MB is what it is set to now but can be changed by you.