Documentation minor update and resource optimization

Author: TaddyHC

content/hardware/04.pro/carriers/portenta-mid-carrier/tutorials/user-manual/assets/ASX00055-step.zip

@@ -179,15 +179,15 @@ The complete schematics are available and downloadable as PDF from the link belo
 
 The complete _STEP_ files are available and downloadable from the link below:
 
-- [Portenta Mid Carrier STEP files](assets/ASX00055-step.zip)
+- [Portenta Mid Carrier STEP files](../../downloads/ASX00055-step.zip)
 
 ### Mechanical Information
 
 In this section, you can find mechanical information about the Portenta Mid Carrier. The board's dimensions are all specified here, within top and bottom views, including the placements of the components onboard.
 
 Suppose you desire to design and manufacture a custom mounting device or create a custom enclosure for your carrier. In that case, the following image shows the dimensions for the mounting holes and general board layout. The given dimensions are all in **millimeters [mm]**.
 
-You can also access the STEP files, available [here](assets/ASX00055-step.zip).
+You can also access the STEP files, available [here](../../downloads/ASX00055-step.zip).
 
 ![Portenta Mid Carrier Dimension Outline](assets/portentaMIDcarrier_Outline.png)