How to Not Have Photosets on Tumblrby Andrea Ruiz
When you make a photo post on Tumblr, the site's posting platform automatically creates a gallery of your photos in your post. Tumblr calls this type of image gallery a "photoset." Tumblr groups all of your photos in a thumbnail gallery in your post, and your visitors can click any of the thumbnails to cycle through and view all your images in a pop-up image carousel. If you'd like to instead post several individual photos to your blog post without grouping them into a photoset, you must upload them individually to your post using the post editor.
Log in to your Tumblr account and click the "Text" button to launch the post editor for a text post. You can also launch a quote, link, audio or video post.
Add the text content to your post as desired. If you created a quote, link, audio or video post instead of a text post, insert that content into the appropriate fields as desired.
Click the camera icon in the post editor menu, browse to the first image file you want to upload and then double-click the image file to upload it to your Tumblr. The image also automatically inserts itself into your post.
Type any text content you want after the image directly into the posting form.
Press "Enter," repeat the process for adding each image to the post and then click the "Post" button to publish the post on your blog.
Tumblr limits each uploaded photo's file size to 10MB. The image can be no larger than 1280 pixels tall by 1920 pixels wide. The only exception is animated GIFs, which can be no larger than 1MB in file size and up to 500 pixels wide.