diff --git a/test/datasets-large-live.jl b/test/datasets-large-live.jl
index 37570f86c..8e282c309 100644
--- a/test/datasets-large-live.jl
+++ b/test/datasets-large-live.jl
@@ -1,20 +1,27 @@
 @info "Uploading test data with prefix: JuliaHubLargeTest_$(TESTID)"
 dataset_name = "JuliaHubLargeTest_$(TESTID)_Blob"
 try
-    open("testdata/large.dat", "w") do io
+    lf_ds, lf_filesize = mktemp() do path, io
         chunk = ones(UInt8, 1024^2)
         # 210 MB forces multipart upload in rclone
         for i = 1:210
             write(io, chunk)
         end
+        close(io)
+        # Upload the file
+        r = JuliaHub.upload_dataset(
+            dataset_name, path;
+            description="some blob", tags=["x", "y", "z"],
+            auth,
+        )
+        r, filesize(path)
     end
-    JuliaHub.upload_dataset(dataset_name,
-        "testdata/large.dat";
-        description="some blob", tags=["x", "y", "z"],
-        auth)
+    @test lf_ds isa JuliaHub.Dataset
+    @test lf_ds.name == dataset_name
+
     datasets = JuliaHub.datasets(; auth)
     blob_dataset = only(filter(d -> d.name == dataset_name, datasets))
-    @test blob_dataset.size == filesize("testdata/large.dat")
+    @test blob_dataset.size == lf_filesize
 finally
     try
         JuliaHub.delete_dataset(dataset_name; auth)