CC-004 Creating Content Be Kind. Source.
Sourcing your posts isn’t just smart, it’s also the right thing to do. For content creators, it means getting credit for what you make. It’s also etiquette when you post content from other sites.
Every Tumblr post allows you to add a source at the bottom of the post. If you're reblogging a post, the source might already be included. If you’re uploading your own content, you’ll want to add your blog as a source. Here’s how to add a source to your post.
Desktop
Click the gear icon in the top right corner
Click next to “Content source”
Add the source link. If it’s your content, put your blog URL
Mobile
Tap the three dots next to “Post”
Tap “Content source”
Add the source link. If it’s your content, put your blog URL
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