If it is source files so you should compile those files in MetaEditor (Metatrader is not using the sources; the Metatrader is using compiled files - ex4 for MT4 and ex5 for Metatrader 5).
About how to install the files from Udemy so you can ask them about it (because we here have nothing to do with Udemy sorry).
Forum on trading, automated trading systems and testing trading strategies
Sergey Golubev, 2020.04.10 06:43
MetaTrader
5 Help - Trading Platform — User Manual
For quick access to these folders, use the
Open
Data Folder command in the File
menu.
If it is source files so you should compile those files in MetaEditor (Metatrader is not using the sources; the Metatrader is using compiled files - ex4 for MT4 and ex5 for Metatrader 5).
About how to install the files from Udemy so you can ask them about it (because we here have nothing to do with Udemy sorry).

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If anybody has a remedy for this situation I would certainly appreciate it. I asked this question yesterday but did not get a resolution.
This is what I did. I purchased a course on Udemy. They supply MQL5 source files created by EA Studio. I placed the source file in my Advisors folder under Experts of my Mt5 platform.
I wanted to run them on strategy tester. When I look in data folder I can see the file in Advisors folder. The source file is not showing up in Navigator where it shows files in Advisor folder.
I can also not see it in when I go to Strategy Tester and look for it. I included a snap shot of what Folders are under my Experts folder.