You will be able to append up to 10 images for the selected few platforms. The below table will help you understand the image limits for each platform:
For all the platforms that have less than 10 images allowed to be published, the number of images will be chronologically added, which means the 1st image will be added for Pinterest and Google My Business and in case of Direct publishing for Instagram for Business accounts. The first 4 images will be published on VK, Twitter, and Instagram (both Business and Personal accounts, if pushed through the mobile reminders using SocialPilot mobile app). And the first 9 images will be used for LinkedIn posts.
For Facebook and Tumblr, the platform allows us to have all the 10 images shared.
You can also refer to our blog for more information on the recommended dimensions to post on various platforms: Click here for the social media image sizes cheat sheet.