diff --git a/tests/artwork_browser_test.mjs b/tests/artwork_browser_test.mjs
index 408f35c..dbcfc55 100644
--- a/tests/artwork_browser_test.mjs
+++ b/tests/artwork_browser_test.mjs
@@ -153,9 +153,18 @@ try{
   assert.deepEqual(await evaluate(`({shown:!$('tipoEnvio').hidden,
     on:[...document.querySelectorAll('#tipoEnvio .cam.on')].map(b=>b.dataset.tipo)})`),
     {shown:true,on:['folha']});
-  await evaluate(`(()=>{const f=new File(['x'],'oversize.cdr');Object.defineProperty(f,'size',{value:128*1048576+1});sel([f]);})()`);
-  assert.equal(await evaluate(`folhas.length===0 && $('recusa').textContent.includes('128 MB')`),true,
-    'files beyond the scanner limit are rejected before browser analysis');
+  await evaluate(`(()=>{const f=new File(['x'],'oversize.cdr');Object.defineProperty(f,'size',{value:5*1073741824+1});sel([f]);})()`);
+  assert.equal(await evaluate(`folhas.length===0 && $('recusa').textContent.includes('5 GB')`),true,
+    'files beyond the 5 GB upload limit are rejected before browser analysis');
+  // A multi-GB sheet is the normal order: graded from the pixel size in its
+  // header, never decoded. 6732 x 35433 px across 57 cm is 3 m at 300 DPI.
+  await evaluate(`(()=>{const h=new Uint8Array(33);h.set([0x89,0x50,0x4E,0x47,0x0D,0x0A,0x1A,0x0A,0,0,0,13,0x49,0x48,0x44,0x52]);
+    const v=new DataView(h.buffer);v.setUint32(16,6732);v.setUint32(20,35433);h.set([8,6,0,0,0],24);
+    const f=new File([h],'folha-grande.png');Object.defineProperty(f,'size',{value:3*1073741824});sel([f]);})()`);
+  await waitFor(()=>evaluate(`folhas.length===1 && !!folhas[0].an`),'large sheet graded from its header');
+  assert.deepEqual(await evaluate(`({grande:folhas[0].an.grande,dpi:folhas[0].an.dpi,alt:folhas[0].med.alt,preview:!!folhas[0].previewSrc})`),
+    {grande:true,dpi:300,alt:300,preview:false});
+  await evaluate(`folhas=[];pintaFolha()`);
   await evaluate(`pickTipo('avulsa')`);
   assert.equal(await evaluate('modo'),'avulsa');
   await evaluate('sendImage()');