-filename<$DateTimeOriginal rename problem

[OOmatrixOO]

Hello.
I use this to rename my photos. And it work.
exiftool -o "Bearbeitet/" -fileOrder DateTimeOriginal "-filename=#%%1.3C.%%le" "-filename<$DateTimeOriginal %%1.3C.%%le" -d %%Y-%%m-%%d -ext jpg

But if i set a underscore after $DateTimeOriginal, it doesnt work anymore.
exiftool -o "Bearbeitet/" -fileOrder DateTimeOriginal "-filename=#%%1.3C.%%le" "-filename<$DateTimeOriginal_%%1.3C.%%le" -d %%Y-%%m-%%d -ext jpg

What can I do to make this work?

Thanks.

[StarGeek]

Because you're adding characters directly onto the end of the tag name, the tag names needs to be separated from the rest of the command.  You can use brace { } characters to do this (see the docs under the -p option).  So try this as your command:

exiftool -o "Bearbeitet/" -fileOrder DateTimeOriginal "-filename=#%%1.3C.%%le" "-filename<${DateTimeOriginal}_%%1.3C.%%le" -d %%Y-%%m-%%d -ext jpg