Introduction:
In Dynamics 365 CRM, we can create a web resource through CRM Classic UI other than Unified User Interface. As an example, let us see the process of creation of web resource in Contact Customizations solution.
Step 1:
Login to the required environment and select required solution [Contact Customizations Solution in this case] as shown in the below figure.

Step 2:
After Step 1, Click on Settings Gear icon at the top of the screen and click on Advance Settings , post that a new window gets opened with classic UI of the selected crm environment as shown in the below figure.

Step 3:
After Step 2, Click on Settings -> Select Solutions under Customization area as shown in the below figure.

Step 4:
After Step 3, under solutions select Contact Customizations Solution and double click solution a new popup window with respective solution components will be shown like the below figure.

Step 5:
After Step 4, click on new -> Webresource as shown in the below figure.

Step 6:
After Step 5, a new web resource window will popups and provide the name ,Display Name, Type and Language with the below values
Name : contactform
Display Name: Contact Classic Form
Type : Script(Jscript)
Language: English
And click on Save and Publish as shown in the below figure.

Step 7:
After Step 6, you cannot save because webresource content should not be empty, so take a javascript file and upload it by using upload button and click on Save and Publish as shown in the below figure.

Step 8:
After Step 7, observe newly created webresource will be present in contact customizations solution as shown in the below figure.

Note:
- Make sure to publish all customizations and upload JavaScript (js) file.
- Took example of web resource of type js , other web resources like html,xml etc., can also be considered.
Conclusion: In this way, one can easily create a web resource through CRM Classic UI interface as well.
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