In a standard Joomla install, it is not possible to attach a file to an article as is commonly available in many other web applications
Fortunately, there's an extension that adds this capability. It's called, simply, Attachments for content articles
1) As with all extensions we'll be showing you, start by going to extensions.joomla.org. Then, navigate to the Directory & Documentation / Downloads category and find the Attachments for content articles page
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2) Click Download
 
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At the top of the page, you'll notice a bunch of language files for this extension. You could install some of them if you wanted, but we're not going to

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3) Download the ZIP file to your computer

4) Once you have the file on your computer, you'll need to extract it. This extension is made up of four separate extensions that you'll need to install individually
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For assistance with finding or installing extensions, watch the first two tutorials in this series
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When all four extensions have been installed, it's time to activate the three plugins
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5) Go to Extensions
 
6) Then click Plugin Manager
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7) Find each plugin and click its Disabled icon to turn the plugin to Enabled
 
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Now, we need to change some of Joomla's settings
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8) Go to Site
 
9) Then Global Configuration
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10) Click the System tab

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The attachments extension uses Joomla's Media Settings to determine what file types can be uploaded
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11) Add any extensions that should be made legal

12) Type the same extensions in uppercase for both versions to work
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13) Change the maximum file size. The default is roughly ten megabytes; 0 is unlimited

14) You'll probably want to make uploads less restrictive to make attachments more useful

15) Changing this setting to No will help do the same thing

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Unless you really trust your members, be careful turning those two settings off, as it can potentially cause a security breach
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16) Click Save
 
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Now, it's time to check out the attachments component
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17) Click Components...
 
18) ...then Article Attachments
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When your users upload attachments to articles, they'll appear here for you to manage

This extension allows you to add attachments to articles here, as well as on the Joomla frontend
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19) Go to New
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20) Click Select article
 
21) Select an article

22) Click Browse
 
23) Find a file to attach

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You can type an alternate name to display here. By default, this extension will use the file's name

24) Type a description

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25) Click Save
 
26) Make sure you publish the attachment, or it won't display

Let's take a look at this extension's settings
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27) Click Parameters
 
There are a number of options you can change here
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In particular, you might want to change "Attachments published by default?" to Yes
 
28) When finished, click Save
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29) Next, go to Admin
 
Here are some extra administrative commands that might be useful to you. Hover your mouse over each link for a description

30) When done, click the X
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Now, let's see if our attachment shows up in the article

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Here it is!

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In order to see a link to add an attachment, we must be logged in as either the owner of this article or an editor or publisher. Let's switch users
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We're now logged in as a Publisher. As you can see here, this Add attachment link has shown up

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We can also edit or delete attachments using the buttons over here
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This is the end of the tutorial. Your Joomla site is now fully capable of having attachments added to its articles