Custom image for shared Add-in ribbon doesn't show.

[gabethegrape]

Hello,
I've got my Excel ribbon tab to the point where a second xlam appears within the drop down menu of the first using the following XML for both. However, the image does not appear when I change menu id to idQ. If I change the idQ back to id, or if I change custom image to imageMso, it works fine. Basically, I'm trying to add (x) number of add-ins to a dropdown menu within my custom tab. Is there a better way to do this so that I can use my custom image?

First Add-in:

<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui"  
xmlns:x="myNameSpace"> 
 
  <ribbon> 
    <tabs> 
      <tab idQ="x:GabeTab" label="RehabCalcs" insertAfterMso="Add-Ins"> 
                 
        <group id="customGroup1" label="Prescription"> 
          <button id="customButton1"  size="large" onAction="OpenCalc" image="Rx2" />         
        </group> 
 
        <group idQ="x:customGroup2" label="Exercises"> 
          <menu idQ="x:MyDropdownMenu" size="large" image="Ex2" > 
            <button id="customButton2" label="Postures"  onAction="Postures"  /> 
          </menu>         
        </group> 
 
    <group idQ="x:customGroup3" label="Assessment"> 
          <menu idQ="x:MyDropdownMenu2"  size="large" image="Ax2"  > 
            <button id="customButton3" label="Ax1Button"  onAction="Macro1"  /> 
        </menu>     
      </group> 
 
    </tab> 
    </tabs> 
  </ribbon>

Second Add-in:

<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui"  
xmlns:x="myNameSpace"> 
 
  <ribbon> 
    <tabs> 
      <tab idQ="x:GabeTab" label="RehabCalcs" insertAfterMso="Add-Ins"> 
                 
        <group idQ="x:customGroup2" label="Exercises"> 
          <menu idQ="x:MyDropdownMenu" size="large" image="Ex2" > 
            <button id="customButton4" label="Two"  onAction="Postures2"  /> 
          </menu>         
        </group> 
 
    <group idQ="x:customGroup3" label="Assessment"> 
          <menu idQ="x:MyDropdownMenu2" size="large" image="Ax2" > 
            <button id="customButton5" label="Yup"  onAction="Macro2"  /> 
        </menu>     
      </group> 
 
    </tab> 
    </tabs> 
  </ribbon> 
</customUI>

Thanks for your help.
Gabe