Unless you are printing spiral bound or single pages it is unlikely that your file needs to bleed into the gutter.
Gutter bleed indesign.
The gutter is the space between each copy of your postcard on the press sheet.
If you actually need to have an inside bleed try this method.
In preset details choose your preferred measurement units.
Gutter is the term that refers to the spacing between the copies on the press sheet which is important to allow for bleeds and trimming.
Due to a bug with indesign exposing a rounding error make sure that elements touching the spine are a bit off the spine.
Peter s right the best way to handle wire o is build the bleed into the document from the start.
Type a bleed value in any units.
Then pull the bleed out in the gutters in your separate pages.
Upon launching indesign click create new.
You ll have to repeat the image on each page and offset for the bleeds.
If you have crossovers you ll need to duplicate the image frame and offset left and right.
In most cases you can set inside bleed to 0.
The best place to start is right at the beginning of the process in the new document window.
I don t think it s possible.
You can add a bleed later by going to file document setup but it can be fiddly as indesign will only apply your revised settings to the pages you currently have selected.
If you manually add an inside bleed you have to watchout for crossovers you ll no longer be able cross a single image across the gutter without losing the part of the image that crosses over.
In the book printing world bleed in particular is an important concept to understand.
If you ve self published or are researching your self publishing options there s a good chance you ve encountered terms like bleed full bleed and gutter margins.
Do a duplicate of your document before starting.
See create a new document to learn more about customizing your new document select the print tab at the top.
If you have an image that stops at the gutter how would indesign know what to bleed.
Also and especially on master pages.