I am having trouble finding the file name of a picture in my gallery to use in my HTML document. Can you help

If the picture you have in your "gallery" is already online, you can just use the url of the picture to add to your document. If you are seeing it through your brower, right-click on it and select 'properties'. This will allow you to see the address of the picture.
If you are creating a html document on your computer that has not been posted online yet, you can use the file location as the link. In the url bar of your browser, type "file:///C:/". This should show you a directory listing of your C: drive. Find your image in there and then you can copy the url from the url bar and use that location as your source.
To insert an image into a html document, use the following tag:

<img src="TheAddressOfYourPicture" />

After replacing TheAddressOfYourPicture with the location of your picture, insert that tag into your html document.

Hope this helps!

Hi,

First, you must tell us if the picture / image has been uploaded in an online storage. You must know on which directory / folder it is uploaded.

I believe you are not looking for a flename but the url of the image.

Is the picture online now? If yes, where is it (URL)?