Doc: Update import 3D assets docs

- Update screenshot
- Remove .blend from supported formats
- Update info about the Import asset dialog
- Some other updates to content and structure

Task-number: QDS-6670
Change-Id: Ia123c5c5b5648a356e9608d923ba1e57c40c8832
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

doc/qtdesignstudio/src/qtquick3d-editor/qtdesignstudio-3d-importing.qdoc

@@ -34,53 +34,10 @@
 
     \title Importing 3D Assets
 
-    You can download \QB from the \l{https://marketplace.qt.io/}{Qt Marketplace}.
-    It enables you to import files you created using 3D graphics applications
-    and stored in several widely-used formats, such as .blend, .dae, .fbx, .glb,
-    .gltf, .obj, .uia, or .uip. For a list of formats supported by each
+    In \QDS, you can import 3D assets in formats such as .stl, .dae, .fbx, .glb,
+    .gltf, .obj, .uia, and .uip. For a list of formats supported by each
     \l{Qt Quick 3D} version, see the module documentation.
 
-    For more information about exporting 3D graphics, see
-    \l{Exporting 3D Assets}.
-
-    \image studio-import-3d.png
-
-    To import 3D assets to \QDS projects:
-
-    \list 1
-        \li Drag-and-drop an external file containing the 3D asset from,
-            for example, File Explorer (on Windows), to \uicontrol {3D Editor}.
-        \li In the \uicontrol {3D Scene Options} tab, select options for
-            importing the file.
-        \li Select \uicontrol Import to import the 3D graphics file.
-        \li When the import is done, select \uicontrol Close.
-    \endlist
-
-    The 3D asset you dragged-and-dropped to \uicontrol {3D Editor} has now
-    been added to your scene, and you can see it in the \uicontrol {3D Editor}
-    view and in \uicontrol Navigator. It is also available in
-    \uicontrol Components > \uicontrol {My 3D Components}.
-
-    Alternatively, you can initiate the import dialog from the
-    \uicontrol Assets view:
-
-    \list 1
-        \li In the \l{Design Views}{Design mode}, select
-            \uicontrol Assets > \inlineimage icons/plus.png
-            .
-        \li Select \uicontrol {3D Assets} in the dropdown menu to filter 3D
-            graphics files.
-        \li Select a file to import, and then select \uicontrol Open.
-        \li In the \uicontrol {3D Scene Options} tab, select options for
-            importing the file.
-        \li Select \uicontrol Import to import the 3D graphics file.
-        \li When the import is done, select \uicontrol Close.
-    \endlist
-
-    The 3D asset now appears in \uicontrol Components >
-    \uicontrol {My 3D Components}. You can add it to the scene by
-    drag-and-dropping it to \uicontrol {3D Editor}.
-
     During the import, you can optimize the files for \QDS. You can remove
     components from meshes to reduce the cache size, find and fix issues in
     the files, optimize graphs and meshes, and so on. The available options
@@ -88,7 +45,45 @@
     or with other 3D graphics tools. See the tooltips in the options dialog
     for more information about a particular option.
 
-    The 3D asset you added to the project now appears in
-    \uicontrol Components > \uicontrol {My 3D Components}. You can add it to
-    your UI by dragging-and-dropping it to \l {3D Editor}.
+    For more information about exporting 3D graphics, see
+    \l{Exporting 3D Assets}.
+
+    \image studio-import-3d.png
+
+    \section1 Importing a 3D Asset
+
+    To import a 3D asset to a \QDS project:
+
+    \list 1
+        \li Drag-and-drop an external file containing the 3D asset from,
+            for example, File Explorer (on Windows), to \uicontrol {3D Editor}.
+        \li In the \uicontrol {3D Scene Options} tab, select options for
+            importing the file.
+            \note To see all options, select \uicontrol{Show All Options}.
+        \li Select \uicontrol Import to import the 3D asset.
+    \endlist
+
+    The 3D asset is now added to your scene, and you can see it in the
+    \uicontrol {3D Editor} view and in \uicontrol Navigator. It is also
+    available in \uicontrol Components > \uicontrol {My 3D Components}.
+
+    Alternatively, you can initiate the import dialog from the
+    \uicontrol Assets view:
+
+    \list 1
+        \li Select \l Assets > \inlineimage icons/plus.png
+            .
+        \li Select \uicontrol {3D Assets} in the dropdown menu to filter 3D
+            graphics files.
+        \li Select a file to import, and then select \uicontrol Open.
+        \li In the \uicontrol {3D Scene Options} tab, select options for
+            importing the file.
+            \note To see all options, select \uicontrol{Show All Options}.
+        \li Select \uicontrol Import to import the 3D asset.
+    \endlist
+
+    The 3D asset now appears in \uicontrol Components >
+    \uicontrol {My 3D Components}. You can add it to the scene by
+    drag-and-dropping it to \uicontrol {3D Editor}.
+
 */