Where is the downloaded attachment file of email?

I have set up my mailbox with the stock email app on my Huawei Mate 9.

Last week, I downloaded an attachment file of a mail. But in the stock Files app, I couldn't locate that attachment file yet.

Do you know which folder it should be in?

Thank you in advance.

Any ideas?

I found it at last after my study. Share it to you all.

In the stock email app, suppose that an email has a .jpg attachment. I tapped the Download icon, then I could view the picture in email app.

But now, this .jpg file had not saved to the storage of phone untill I then tapped the Save icon.

Just then the attachment file was actually saved in folder, 'Internal storage / Download / email'.

Have a Good weekend to you all.

After you tap the Download icon next to an email attachment in stock email app, the attachment .jpg file will be saved in 'Internal storage - Android - data - com.android.email'.
And then if you tap the Save icon next to the email attachment, the attachment .jpg file will be saved in 'Internal storage / Download / email'.