There are a few ways to submit figure captions with your submission. If the journal provides for a submission item type called "Figure Caption", submit your caption here in the form of a text file. If there is no submission item type provided for "Figure Caption", you should list your figure captions at the end of your manuscript text file. If you are including a figure caption in the image itself, or a label like "Fig. 1", please ensure to keep it outside of the image area itself, like at the bottom, for instance.