Panel Working In Photoshop but Not InDesign

Hi everyone,

I recently submitted a Photoshop/InDesign extension to Adobe Exchange. The review team has informed me that the panel works in Photoshop but returns a blank screen in InDesign.

Everything works fine on my end and I haven't been able to reproduce the bug so I'm stumped as to what the issue could be. The HTML and JavaScript load function are almost identical on both versions so I'm thinking it must be a problem with my manifest.xml or xmi. I'm testing in InDesign 2019 and 2020.

Hoping to gain some clarity on what the problem might be. I've included my manifest.xml and mxi below. Any help is greatly appreciated, thanks!

manifest.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<ExtensionManifest xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ExtensionBundleId="com.scotton.sample" ExtensionBundleVersion="1.1.0" Version="5.0">
  <ExtensionList>
    <Extension Id="com.scotton.sample.panel" Version="1.1.0"/>
  </ExtensionList>
  <ExecutionEnvironment>
    <HostList>
      <Host Name="PHSP" Version="20.0" />
      <Host Name="PHXS" Version="20.0" />
      <Host Name="IDSN" Version="14.0" />
    </HostList>
    <LocaleList>
      <Locale Code="All"/>
    </LocaleList>
    <RequiredRuntimeList>
      <RequiredRuntime Name="CSXS" Version="5.0" />
    </RequiredRuntimeList>
  </ExecutionEnvironment>
  <DispatchInfoList>
    <Extension Id="com.scotton.sample.panel">
      <DispatchInfo>
        <Resources>
          <MainPath>./index.html</MainPath>
          <ScriptPath>./scripts/main.jsx</ScriptPath>
        </Resources>
        <Lifecycle>
          <AutoVisible>true</AutoVisible>
        </Lifecycle>
        <UI>
          <Type>Panel</Type>
          <Menu>Sample</Menu>
          <Geometry>
            <Size>
              <Height>400</Height>
              <Width>300</Width>
            </Size>
            <MaxSize>
              <Height>800</Height>
              <Width>1200</Width>
            </MaxSize>
            <MinSize>
              <Height>300</Height>
              <Width>200</Width>
            </MinSize>
          </Geometry>
        </UI>
      </DispatchInfo>
    </Extension>
  </DispatchInfoList>
</ExtensionManifest>

mxi

<?xml version="1.0" encoding="UTF-8"?>
<macromedia-extension
  id="com.scotton.sample"
  name="Sample"
  requires-restart="true"
  version="1.1.0">

  <author name="Shelby Cotton" />

  <description>
    <![CDATA[Description]]>
  </description>

  <ui-access>
    <![CDATA[Instructions]]>
  </ui-access>

  <products>
    <product familyname="Photoshop" platform="mac" version="20" />
    <product familyname="InDesign" platform="mac" version="14" />
  </products>

  <files>
    <file source="Extension/html.zxp"
      destination=""
      file-type="CSXS"
      products="Photoshop"
      platform="mac"
      minVersion="20.0" />

    <file source="Extension/html.zxp"
      destination=""
      file-type="CSXS"
      products="InDesign"
      platform="mac"
      minVersion="14.0" />
  </files>
</macromedia-extension>