Naming/File Convention 2020+
2019 is less organized, but similar convention, see below

ALL FILES IN JPG FORMAT

File Path:
All other years in File Path .../JMA/YYYY/Month/Filename

File Name:
Each Edition consists of 2 entries, 1 and 2. For each article there are usually 1-3 images, each with suffix 'A', 'B', 'C', etc. 
If there is more than 1 edition in a month, then the new entries will be 3 and so on.
For example the 2nd image of the 2nd entry of the January 2020 edition is in .../JMA/2020/January/2B.jpg.


2019:
Month Files are in the JMA root folder, each entry is labelled with 'A' and 'B' instead of '1' and '2', each image is labelled with '1', '2', '3', etc. 
This means the 2nd Entry's 3rd image is .../JMA/Month/SPB3.jpg Not all edition followed this, but is a good general guideline. more of a shitshow