diff --git a/packages/form-js-viewer/src/render/components/form-fields/DocumentPreview.js b/packages/form-js-viewer/src/render/components/form-fields/DocumentPreview.js
index 24234f3a5..4f345a2dd 100644
--- a/packages/form-js-viewer/src/render/components/form-fields/DocumentPreview.js
+++ b/packages/form-js-viewer/src/render/components/form-fields/DocumentPreview.js
@@ -75,7 +75,7 @@ DocumentPreview.config = {
   name: 'Document preview',
   create: (options = {}) => ({
     label: 'Document preview',
-    endpointKey: '=defaultDocumentsEndpointKey',
+    endpointKey: DEFAULT_ENDPOINT_KEY,
     ...options,
   }),
 };
@@ -83,6 +83,7 @@ DocumentPreview.config = {
 // helpers /////////////////////////////
 
 const DOCUMENT_ID_PLACEHOLDER = '{documentId}';
+const DEFAULT_ENDPOINT_KEY = '=defaultDocumentsEndpointKey';
 
 /**
  * @typedef GetErrorOptions
@@ -98,16 +99,18 @@ function getErrors(options) {
   let errors = [];
 
   if (!isString(dataSource) || dataSource.length < 1) {
-    errors.push('Data source is not defined.');
+    errors.push('Document reference is not defined.');
   }
 
   if (!isString(endpointKey) || endpointKey.length < 1) {
     errors.push('Endpoint key is not defined.');
   }
 
-  if (!URL.canParse(endpoint)) {
-    errors.push('Endpoint is not valid.');
-  } else if (!isValidDocumentEndpoint(endpoint)) {
+  if (endpointKey !== DEFAULT_ENDPOINT_KEY && !URL.canParse(endpoint)) {
+    errors.push(
+      `If you change the endpoint key from "${DEFAULT_ENDPOINT_KEY}", the document preview won't work with Camunda Tasklist and you must provide a valid URL.`,
+    );
+  } else if (endpointKey !== DEFAULT_ENDPOINT_KEY && !isValidDocumentEndpoint(endpoint)) {
     errors.push('Endpoint must contain "{documentId}".');
   }
 
diff --git a/packages/form-js-viewer/test/spec/render/components/form-fields/DocumentPreview.spec.js b/packages/form-js-viewer/test/spec/render/components/form-fields/DocumentPreview.spec.js
index 4a826b132..ef9314627 100644
--- a/packages/form-js-viewer/test/spec/render/components/form-fields/DocumentPreview.spec.js
+++ b/packages/form-js-viewer/test/spec/render/components/form-fields/DocumentPreview.spec.js
@@ -42,29 +42,11 @@ describe('DocumentPreview', function () {
     // when
     const { container } = createDocumentPreview({
       initialData: {
-        defaultDocumentsEndpointKey: false,
+        foobar: false,
       },
-      services: {
-        expressionLanguage: mockExpressionLanguageService,
-      },
-    });
-
-    // then
-    const formField = container.querySelector('.fjs-form-field');
-
-    expect(formField).to.exist;
-    expect(formField.classList.contains('fjs-form-field-documentPreview')).to.be.true;
-
-    expect(screen.queryByText('Endpoint is not valid.')).to.exist;
-  });
-
-  it('should handle bad endpoint format', function () {
-    // when
-    const { container } = createDocumentPreview({
-      initialData,
       field: {
         ...defaultField,
-        dataSource: undefined,
+        endpointKey: '=foobar',
       },
       services: {
         expressionLanguage: mockExpressionLanguageService,
@@ -77,16 +59,20 @@ describe('DocumentPreview', function () {
     expect(formField).to.exist;
     expect(formField.classList.contains('fjs-form-field-documentPreview')).to.be.true;
 
-    expect(screen.queryByText('Data source is not defined.')).to.exist;
+    expect(
+      screen.queryByText(
+        'If you change the endpoint key from "=defaultDocumentsEndpointKey", the document preview won\'t work with Camunda Tasklist and you must provide a valid URL.',
+      ),
+    ).to.exist;
   });
 
-  it('should handle missing endpoint', function () {
+  it('should handle bad endpoint format', function () {
     // when
     const { container } = createDocumentPreview({
       initialData,
       field: {
         ...defaultField,
-        endpointKey: undefined,
+        dataSource: undefined,
       },
       services: {
         expressionLanguage: mockExpressionLanguageService,
@@ -99,8 +85,7 @@ describe('DocumentPreview', function () {
     expect(formField).to.exist;
     expect(formField.classList.contains('fjs-form-field-documentPreview')).to.be.true;
 
-    expect(screen.queryByText('Endpoint key is not defined.')).to.exist;
-    expect(screen.queryByText('Endpoint is not valid.')).to.exist;
+    expect(screen.queryByText('Document reference is not defined.')).to.exist;
   });
 
   it('should handle missing data source', function () {