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+[**English**](Multimedia.en) | [Español](Multimedia.es)
+
+# Attach/embed multimedia content
+
+## Where?
+
+It is possible to attach/embed multimedia content in the following options:
+* [HOME > Timeline](START.Timeline.en), both in the posts and in the comments.
+* [EVALUATION > Test > Write question](ASSESSMENT.Tests.en#writing-a-question), both in the stem and in each of the single or multiple choice answers.
+* [MESSAGES > Forums > New discussion](MESSAGES.Forums.en#new-thread) and [MESSAGES > Forums > New comment](MESSAGES.Forums.en#new-post)
+* [MESSAGES > Write new message](MESSAGES.Write.en)
+
+## How?
+
+To attach/embed multimedia content you can click on one of the three icons shown, depending on the type of content:
+
+* **Upload an image or video file** (click the _multimedia file_ icon, on the left) that you have previously stored in your computer or device. When you click on the icon, a form with three fields appears:
+    * File selector. By clicking on it you can select a file from your computer or device. The file can be:
+        * A JPG, PNG, static GIF, or TIF image, with no size limit. The platform will convert the image to JPG format and reduce its size if necessary.
+        * An animated GIF image that does not exceed a certain size in bytes.
+        * An MP4, OGG or WEBM video that does not exceed a certain size in bytes.
+    * Link (optional).
+    * Title or attribution of the image (optional).
+* **Embed a YouTube video** (click the _YouTube_ icon, in the center). When you click on the icon, a form with one field appears:
+    * Link to YouTube video. The platform processes this link to find the code associated with the video and use it to create an embedded video link.
+* **Embed other multimedia content from an external website** (click the _HTML code_ icon, on the right). You can embed multimedia content such as videos, images, presentations, maps, etc. from different websites that offer links of the `<iframe>` type, such as YouTube, Vimeo, Slideshare, Google Maps, etc. When you click on the icon, a form with one field appears:
+    * Link to the URL of the embedded multimedia content. The original website can have a _Share_ button or link that will offer you an HTML code of the type `<iframe src="URL" ...></iframe>`. The URL that you have to copy into the form is the one that appears in the `src` attribute of the `iframe` tag. If you copy a URL other than the one in the `src` attribute of `iframe`, or if you copy all the HTML code `<iframe src="URL" ...></iframe>`, or if the original web does not provide a `<iframe>`-type code, the content will not be displayed correctly.