The Samsung Galaxy Z Fold 4 had not been released, and no official information was available about its specifications or features. Therefore, I cannot provide specific details about the Galaxy Z Fold 4 (256+12) variant.

The Samsung Galaxy Z Fold series consists of foldable smartphones with innovative designs and advanced features. If the Galaxy Z Fold 4 were to be released in the future, it could be expected to offer improvements over its predecessor, the Galaxy Z Fold 3.

Some possible features that could be found in a Samsung Galaxy Z Fold 4 (256+12) variant might include:

1. Foldable Design: The Galaxy Z Fold 4 would likely feature a foldable design, allowing the device to transition between a smartphone and a tablet-like form factor.

2. Display: It could potentially have an improved foldable display, providing a larger viewing area and high-resolution visuals. It might incorporate technologies like Dynamic AMOLED or LTPO for vibrant colors and energy efficiency.

3. Storage and RAM: The "256+12" specification could indicate that the device has 256GB of internal storage and 12GB of RAM. However, these specifications are purely speculative and subject to change based on the actual release.

4. Processor and Performance: The Galaxy Z Fold 4 might come equipped with a powerful processor for smooth multitasking and enhanced performance, similar to Samsung's flagship smartphones.

5. Camera System: It could feature an advanced camera setup, including multiple lenses for capturing high-quality photos and videos.

6. Software: The device would likely run on Samsung's custom user interface, possibly the latest version of One UI, optimized for the foldable form factor.

Please note that the details provided above are based on speculation and assumptions, as no official information about the Samsung Galaxy Z Fold 4 (256+12) variant is available. To get accurate and up-to-date information, it's best to refer to official announcements from Samsung or trusted sources closer to the device's release date.