Emailing portals only allow you to attach files in emails, unlike cloud storages. Let us say that you have to attach a 100 files in an email and you select all of them together, they will only be attached as separate files and not a folder (given that you do not exceed the file size limit for email). This can be a problem if you want the receiver to automatically figure out the categorization you have made in these files (if you have made any). You will explicitly have to mention the files that belong to one category and the ones that belong to the other. Elsewise, you will have to send a separate email with a different category attached to it. Both of these options are quite infeasible.
The easiest way to deal with it in Windows 10 is to put files in different folders and zip the folders separately. Zipping them converts them into one file. The receiver, however, should also have a zip application which can “unzip” the file to convert it back to the folder. The method below describes how you can send multiple files as a single attachment.
Select all of the files that you wish to send via email and copy them to a new folder. Now, right click on the folder and then select Send to. Selecting this will give you multiple options, look for the one that says Compressed (zipped) folder. Select this option and it will convert your folder into a zipped file. This file will be made in the same folder that contains your target folder.
Once you are through with this, just select this newly made zipped file from your emailing portal rather than the folder and this will allow you to send all files as a single attachment.