[[FileUpload $extensions=`zip,jpg,bmp,doc' $maxsize=4194304 $tpl=`upload1` &path=`/assets/uploads/`]]
There are a few errors in your call:
1) You have a ’ at the end of the extensions, remember to always use ` (backticks) rather than single quotes ’.
2) In the call you should use & to identify the parameters not $.
3) You need a ? after the snippet name and before the parameters. [[FileUpload? &extensions...
4) this is not an error but can help at times, when [[shippet]] does not work try the uncached version [!snippet!].
Corrected it would look like:
[!FileUpload? &extensions=`zip,jpg,bmp,doc` &maxsize=`4194304` &tpl=`upload1` &path=`/assets/uploads/`!]
The documentation has a good example of how to use it.