Parser functions or parameters don't work inside <gallery> tags. You have to use the {{#tag: parser function for this.

{{#tag:gallery|
{{#if:{{{dynamic|}}}|{{{dynamic}}}}}
{{#if:{{{compatibility|}}}|{{{compatibility}}}}}
{{#if:{{{sentiment|}}}|{{{sentiment}}}}}
|spacing=small|captionalign=center|bordersize=none|columns=3}}

To explain a bit more, it is important to distinguish between extension tags and other aspects of wikitext such as parser functions, magic words, and templates. They are processed in a certain order and so, generally speaking, things like parser functions, magic words, etc. do not get fully processed (if at all) when inside tags such as gallery, tabber, ref, or dpl (to name a few). The built-in workaround that MediaWiki has is the #tag parser function which allows you to specify an extension tag to apply after the wikitext is processed. Of course, the downside to this is that things like tables will need to be escaped using the {{!}} magic word.

@Oot42

Thank you!

I was wondering it the work around worked like the tabber within tabber tag. But wasn't sure how to implement.

@Andrewds1021

Yes, that is right ty!

Ok now I am trying to add #switch within the #if within the gallery and running into issues.

{{#tag:gallery|
{{#if:{{{dynamic|}}}|
 {{#switch: {{lc:{{{dynamic}}}}}
 |#default   = {{{dynamic}}}
 |Close      = TS4 Family Dynamic Close.png{{!}}Close
 |Distant    = TS4 Family Dynamic Distant.png{{!}}Distant
 |Supportive = TS4 Family Dynamic Supportive.png{{!}}Supportive
 |Permissive = TS4 Family Dynamic Permissive.png{{!}}Permissive
 |Difficult  = TS4 Family Dynamic Difficult.png{{!}}Difficult
 |Strict     = TS4 Family Dynamic Strict.png{{!}}Strict
 |Jokesters  = TS4 Family Dynamic Jokesters.png{{!}}Jokesters
 }}
}}
{{#if:{{{compatibility|}}}|
 {{#switch: {{lc:{{{compatibility}}}}}
 |#default   = {{{compatibility}}}
 |Good       = TS4 Social Compatibility Positive.png{{!}}Good
 |Positive   = TS4 Social Compatibility Positive.png{{!}}Good
 |Bad        = TS4 Social Compatibility Negative.png{{!}}Bad
 |Negative   = TS4 Social Compatibility Negative.png{{!}}Negative
 }}
}}
{{#if:{{{sentiment|}}}|
 {{#switch: {{lc:{{{sentiment}}}}}
 |#default   = {{{sentiment}}}
<!-- Positive -->
 |Adoring    = Icon sentimentBit Adoring ST generic.png{{!}}Adoring
<!-- Negative -->
 |Hurt       = Icon sentimentBit Hurt ST generic.png{{!}}Hurt
 }}
}}
|spacing=small|captionalign=center|bordersize=none|columns=3}}

In the switches, you are using

{{lc:{{{parameter}}}}}

which turns the value of "parameter" to lower case.

This is actually a good idea when comparing values, as it makes your template non case sensitive and therefore eliminates a potential editing error.

However, you compare your now turned to lower case input with capitalized words in the switch, so there will never be a hit, it will always return #default.

You have to change the words you compare the input with to be lower case. Then it will work.

@Oot42

Oh, ty, I usually do lower case, I think this was the first time I used with upper case.