title: Image imported to drawable folder but does not show up when trying to set it to an ImageView
body: <p>I imported three images to my Android Studio (version 3.1.3) project by dragging them to the drawable folder (2 png, 1 jpg) and then File > Sync Project With Gradle Files.</p>
  
  <p>In the xml file activity_main.xml (Text Mode), I type <code>android:src="@drawable/"</code> and I get my 2 png images as a suggestion but not the one I want to use (the jpg image).</p>
  
  <p>Then I tried to set my src component using the activity_main.xml in Design Mode, selecting ImageView > src > ... . This opens a window with your Drawable content (Project, android, Theme attributes). Into Drawbale>Project I see the default android images and the two png images that I imported but the jpg is not there.</p>
  
  <p>Then I delete all three images, Sync Project With Gradle Files, add the jpg file to the drawable file, Sync Project With Gradle Files and still did not show it when I tried to add it.</p>
  
  <p>I saw that someone posted somewhere that he had a bug with the first image located in the drawable folder, and he import again the same image with a different name and it worked for him, tried but no success.</p>