Many thanks for your response I have done some further investigation;
(1) I’m using usegalaxy.org
Command to download a collection [FAILS];
wget -O MyTestArchive.tgz 'https://usegalaxy.org/api/dataset_collections/bcaddaXXXe5aafbb/download’?key=90a1876062110873XXXXX38a426cca8a
NB: I’ve redacted the data ID and my api key using XXX - I can confirm the correct details were provided in the command.
Running this command twice, results in two different file sizes as below, none of which are anywhere near the expected size - I have 20 files in the collection, many of which are several Gb each;
MyTestArchive.tgz [ <=> ] 175.44M 6.60MB/s in 43s
MyTestArchive.tgz [ <=> ] 208.08M 3.18MB/s in 48s
Command to download a single file from within a collection [WORKS];
wget -O SingleFileWithinCollection.tgz ‘https://usegalaxy.org/datasets/bbdXXXXXcb8906b5fc7e7eced1d68b4e/display?to_ext=data&hdca_id=bcadda227e5aafbb&element_identifier=ID1-DZ_A_TTACCGAC-CGTATTCG_L008.fastq.gz’?key=90a1876062110873XXXXX38a426cca8a
Conclusions; individual files from within a collection appear to be accessible and download correctly using wget or curl. However, when attempting to download the entire collection (by capturing the collection url from the disk icon), the download stops at an apparently random point. Yesterday I found this to be ~ 1.08Gb, whereas today, this appears to be ~ 200Mb.
Your help is most appreciated.