Upload data size limits and vcf datasets in a docker Galaxy

Hi @jennaj,
I just read in another topic, that @wm75 recommends, loading the vcf file marking the as .vcf datatype, so that they get unpacked when uploaded (How/ where can I download Annotation exac03(hg19) database and import it to Galaxy? - #2 by wm75). So I guess this is better than my idea of using the pencil icon after the upload to change the datatype into .vcf? Can I somehow check if my data got decompressed?
Thank you ever so much!
All the best,
Rose