We received some rasters from the Belize team that wouldn't upload. They would hang and timeout on the reprojection step. The original file was in a region-specific CRS so I converted to 4326, but the same thing occurred in seasketch. I converted again to 3857 and the upload worked. Here's the original tiff:
BZ25_S2_10m_Coral_prob_uint16_1=1000.tif