About manually created image URLs

[イルカのえっちゃん]

I have previously asked the following question,
https://www.googlecloudcommunity.com/gc/AppSheet-Q-A/Secure-PDF-access-amp-Secure-Image-access/td-p/700205

My English is not very good and I may not have conveyed it well.
Therefore, I would like to change my question as follows

Question

Secure Image access is on.
Require Image and File URL Signing is off

In Security>Options, set as above.
Next, manually create the image URL using the following method.
https://support.google.com/appsheet/answer/10107317?hl=en&sjid=1176134514394052012-NA

I am aware that if a user who has not shared the app accesses this URL, the image will still be displayed.
Is this understanding correct?
If correct, is there any way to limit the display of this image URL to accounts that have shared the app?

Translated with www.DeepL.com/Translator (free version)

[イルカのえっちゃん]

I had asked the above question, but today I confirmed that when “Secure Image access” is turned on, the image is not displayed when an account that has not shared the app accesses the URL.
I think the image used to be displayed even with the above settings, but I may have been mistaken.
Sorry for the trouble.
The matter is now resolved.