updated manual

erpnext/docs/user/manual/en/using-erpnext/articles/adding-file-as-a-attachment.md

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+#Adding File as a Attachment
+
+ERPNext allows to attach files with documents. User with a read permission on particular document will also be able to access files attached with it.
+
+###Attach New File
+
+There are several ways to attach file to the document.
+
+####From Browser
+
+<img alt="Sales Order File Attachment" class="screenshot" src="{{docs_base_url}}/assets/img/articles/attach-file-1.gif">
+
+####By drag and drop
+
+<img alt="Sales Order File Attachment" class="screenshot" src="{{docs_base_url}}/assets/img/articles/attach-file-2.gif">
+
+Click on Attach to browse and select the file.
+
+####Link
+
+If you use separate server for files, or use online service like Dropbox, you can attach file by providing link of a particular file.
+
+<img alt="Sales Order Select File" class="screenshot" src="{{docs_base_url}}/assets/img/articles/attach-file-3.gif">
+
+`For hosted users, limit of 5 MB is applied on file size.`
+
+To ensure there are not many files attached to a document, which can affect your accounts performance, you can set limit as how many files can be attached to a particular document. Click [here]({{docs_base_url}}/user/manual/en/customize-erpnext/articles/increase-max-attachments.html) to learn more about it.
+
+####File Manager
+
+Check following link to learn how files are managed in ERPNext.
+
+<iframe width="660" height="371" src="https://www.youtube.com/embed/4-osLW3E_Rk" frameborder="0" allowfullscreen></iframe>
+
+
+<!-- markdown -->