I was trying to bring to sead2-beta Luigi's sead2-dev example that demonstrates the ability to view multiple geospatial layers on one map. In sead2-dev, https://sead2-dev.ncsa.illinois.edu/datasets/56318f89e4b05b5c9359310b has two geospatial files. The visualizations tab has a cool map that works and shows both layers. I downloaded this dataset and recreated in in sead2-beta (https://sead2-beta.ncsa.illinois.edu/datasets/573a1c73e4b07f309654d704) but one of the files (Major_tribus.zip) fails to create the preview and I can't make the extractors work on it (tried to delete and reupload). Thus, on the single map under the Visualizations tab I'm able to see only one layer... Any idea why Major_tribus.zip doesn't have a preview in sead2-beta? What other trouble shooting steps I can try when I encounter an issue with an extractor?