As I understand it, it all depends on how the parser interprets the alphanumeric commands within the brackets
Most commands will use a
beginning tag [xxxx] and
ending tag [/xxxx] -although the end tag is not always necessary
For example,
[b] = start BOLD
[/b] = end BOLD
or
[html]HTML CODE HERE[/html]
The parser interpreter looks for specific alphanumeric keywords within the tag brackets.
Generally, you should use lower case characters within bracket commands.
Sorry this has become so cumbersome to add videos.
I am still planning a major software upgrade with better support for videos soon.