A more general way of describing the problem with your example that might 
help you next time: the value of an HTML attribute like *src* can be 
exactly *one of* four things: a "constant string in quotation marks" that 
never changes, or a transclusion of a {{{ filter result }}}, {{tiddler 
field}}, or <<macro call/variable reference>> – but never a combination of 
two or more of those things.* To make things just a little bit murkier but 
hopefully not too much, either a single filter or a single macro can be 
used to *create *a combination of those things, and then you can pass that 
result to the HTML attribute, as in Mark's example.

* Actually, there are other syntaxes for a constant string, but that's not 
relevant here.
On Monday, January 18, 2021 at 12:45:27 PM UTC-6 Boazter wrote:

> Yes, thank you!
>
> On Mon, Jan 18, 2021 at 10:44 AM 'Mark S.' via TiddlyWiki <
> [email protected]> wrote:
>
>>
>>
>> On Monday, January 18, 2021 at 9:54:10 AM UTC-8 Boazter wrote:
>>
>>> *Note to self*: Research and practice with "addsuffix"
>>>
>>>>
>>>>
>> And sometimes "addprefix"
>>  
>>
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