Import data to a detail table in a master/detail edit page

I walked through some threads and now I know how to code in the before insert function of the detail table's import page. However, I am stilling having problem not seeing the import button for the detail table even I have checked the import option in the page setting. How can I enable it? Thanks

If you are using access control you need to tick the Import page to allow the imports:

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I don't use the nested master details, but in this case click on proceed to details so that you will be on a page where you have the master record and the details and then it should be there:
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Thank you for your reply. I have the import box checked but still cannot get it done. My master and detail records are on the same page therefore the 'import' points to the header table. I would like to have another 'import' button which points to the detail table.

I also tried to insert the standard button 'Import' to my detail table's list page but still doesn't work. The import buttone does not come up.

My work around is to use a custom button to open the import page